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質譜儀簡介(Translated by ABDC) http://en.wikipedia.org/wiki/Mass_spectrometry

Mass spectrometry (MS) is an analytical technique that produces spectra (singular spectrum) of the masses of the molecules comprising a sample of material.

The spectra are used to determine the elemental composition of a sample, the masses of particles and of molecules, and to elucidate the chemical structures of molecules, such as peptides and other chemical compounds.

Mass spectrometry works by ionizing chemical compounds to generate charged molecules or molecule fragments and measuring their mass-to-charge ratios.[1]

質譜是一個用來得出組成樣品材料分子物質譜圖的一種分析技術. 此種譜圖用來測定樣品的基本組成, 粒子以及分子的質量, 以及印證分子的化學結構, 例如肽及其他化合物. 四極桿離子阱的一個衍生型態
質譜法(MS)是以使化合物離子化以產生代電荷的粒子或分子的片段, 以及量測它們的質量/電荷 比值, 的方式進行其工作.

In a typical MS procedure, a sample, which may be solid, liquid, or gas, is ionized. The ions are separated according to their mass-to-charge ratio.[1] The ions are detected by a mechanism capable of detecting charged particles.

Signal processing results are displayed as spectra of the relative abundance of ions as a function of the mass-to-charge ratio. The atoms or molecules can be identified by correlating known masses to the identified masses or through a characteristic fragmentation pattern.

在一個典型的質譜程序, 一個樣品, 它可能是固體, 液體或氣體, 被離子化. 這些離子是依據它們的質量/電荷 比值的差異被分離的. 這些離子是是以一種能夠檢測代電荷粒子的機制被檢測.
訊號處理結果是以各離子之間的相對含量與質量/電荷 比值的函數關係的譜圖被展示出來. 這些原子或分子能以與已知物質做相關程度作比對, 或則經由特定的碎片形態特徵的方式被確認出來.

A mass spectrometer consists of three components: an ion source, a mass analyzer, and a detector.[2] The ionizer converts a portion of the sample into ions. There is a wide variety of ionization techniques, depending on the phase (solid, liquid, gas) of the sample and the efficiency of various ionization mechanisms for the unknown species.

An extraction system removes ions from the sample, which are then trajected through the mass analyzer and onto the detector. The differences in masses of the fragments allows the mass analyzer to sort the ions by their mass-to-charge ratio. The detector measures the value of an indicator quantity and thus provides data for calculating the abundances of each ion present. Some detectors also give spatial information, e.g. a multichannel plate.


一個取出系統從樣品裏移出了離子, 然後被投射到質量分析器, 以及到達偵檢器. 碎片之間的質量差異, 使得質量分析器能夠依據這些離子的質量/電荷 比值來排序. 偵檢器量測指標的數值, 如此便可提供計算所存在離子的含量計算所需的數據. 某些偵檢器也可得到空間的資訊, 例如多通道檢測盤.

Mass spectrometry has both qualitative and quantitative uses. These include identifying unknown compounds, determining the isotopic composition of elements in a molecule, and determining the structure of a compound by observing its fragmentation.

Other uses include quantifying the amount of a compound in a sample or studying the fundamentals of gas phase ion chemistry (the chemistry of ions and neutrals in a vacuum).

質譜同時具有定性及定量用途. 包括確認出未知化合物, 決定一個分子裏的元素的同位素組成, 以及以觀察其碎片的方式來測定化合物的結構.

其他用途包括定量樣品中的某個化合物的含量, 或是氣相離子化學的基礎研究(真空中的離子或中性物質的化學).

MS is now in very common use in analytical laboratories that study physical, chemical, or biological properties of a great variety of compounds.
As an analytical technique it possesses distinct advantages such as:
1. Increased sensitivity over most other analytical techniques because the analyzer, as a mass-charge filter, reduces background interference
2. Excellent specificity from characteristic fragmentation patterns to identify unknowns or confirm the presence of suspected compounds.
3. Information about molecular weight.
4. Information about the isotopic abundance of elements. 5. Temporally resolved chemical data.


質譜在現今非常多的各種化合物的物理, 化學, 及生物學性質研究的分析化學實驗室, 是非常通用的.
作為一種分析技術, 它擁有不同的優點如:
1.比幾乎是大部份其他分析技術更靈敏, 因為其分析器, 作為一種質量-電荷的過濾器, 減少了背景干擾.
2.經由碎片型態的特徵來確定未知成份或是確認疑似化合物的存在等, 所具有的優異的專一性.
3.分子量的資訊.
4.元素同為素含量的資訊.
5.暫時得到的化學數據.

A few of the disadvantages of the method is that often fails to distinguish between optical and geometrical isomers and the positions of substituent in o-, m- and p- positions in an aromatic ring. Also, its scope is limited in identifying hydrocarbons that produce similar fragmented ions.[3]

這個方法的少數缺點是, 它經常無法區分出光學以幾何異構物, 以及的芳香環上的取代基在臨位-, 間位-,及對位-位置. 而且, 在會產生相似碎片的碳水化合物的辯識上, 其應用範圍是受限的.


Etymology(辭源)
The word spectrograph had become part of the international scientific vocabulary by 1884.[4][5] The linguistic roots are a combination and removal of bound morphemes and free morphemes which relate to the terms spectr-um and phot-ograph-ic plate.[6] Early spectrometry devices that measured the mass-to-charge ratio of ions were called mass spectrographs which consisted of instruments that recorded a spectrum of mass values on a photographic plate.[7][8]


spectrograph(攝譜儀)這個字在1884年時就已經成為國技科學字彙的一部份了. 其語言學的根源是與 spectr-um 以及 phot-ograph-ic plate 兩個術語有關的 結合語素和自由語素 的結合與移除. 早期用來量測離子的質量/電荷 比值的光譜儀設備稱為質量攝譜儀, 它是由把質量譜圖記錄在照相版上的一些儀器所組成的.

A mass spectroscope is similar to a mass spectrograph except that the beam of ions is directed onto a phosphor screen.[9] A mass spectroscope configuration was used in early instruments when it was desired that the effects of adjustments be quickly observed. Once the instrument was properly adjusted, a photographic plate was inserted and exposed.

除了離子束是被引導到螢光屏之外, mass spectroscope(質量分光鏡)與mass spectrograph(質量攝譜儀)類似. 在早期使用的儀器裏 , 當要能夠很快地觀察調整所產生的效應時, 就會用到質量分光鏡(mass spectroscope)的組態.

The term mass spectroscope continued to be used even though the direct illumination of a phosphor screen was replaced by indirect measurements with an oscilloscope.[10] The use of the term mass spectroscopy is now discouraged due to the possibility of confusion with light spectroscopy.[1][11] Mass spectrometry is often abbreviated as mass-spec or simply as MS.[1]

甚至到了直接 照射到到螢光屏的方式已被示波器的非直接量測方式取代之後, 質量攝譜儀(mass spectrograph)的術語仍繼續被使用. 由於有與光學上的光譜儀(ligh spectroscopy)混淆, 使用質量光譜儀(mass spectroscopy)這個術語, 現今不被鼓勵的. 質譜(Mass spectrometry) 經常縮寫成 mass-spec 或簡化為 MS.[1]

History 歷史
For more details on this topic, see History of mass spectrometry. 有關此主題的更多詳細內容, 請閱質譜的歷史.

Replica of an early mass spectrometer
早期質譜儀的複製品

In 1886, Eugen Goldstein observed rays in gas discharges under low pressure that traveled away from the anode and through channels in a perforated cathode,opposite to the direction of negatively charged cathode rays (which travel from cathode to anode). Goldstein called these positively charged anode rays "Kanalstrahlen"; the standard translation of this term into English is "canal rays".

在 1886年, Eugen Goldstein觀察到, 在低壓氣體放電中, 由陽極出來並經過穿孔的陰極通道的射線, 與帶負電的陰極射線方向是相反的(它是由陰極到陽極的). Goldstein稱這些帶正電的陽極射線為"Kanalstrahlen", 此術語的英文標準翻譯為"canal rays"

Wilhelm Wien found that strong electric or magnetic fields deflected the canal rays and, in 1899, constructed a device with parallel electric and magnetic fields that separated the positive rays according to their charge-to-mass ratio (Q/m). Wien found that the charge-to-mass ratio depended on the nature of the gas in the discharge tube. English scientist J.J. Thomson later improved on the work of Wien by reducing the pressure to create the mass spectrograph.

在1899年, Wilhelm Wien 發現強電或磁場會區折流道中的射線, 同時也建構了一個具有平行電及磁場的設備, 可依據它們的 電荷/質量(Q/m) 比值來分開這些正射線. Wien 發現電荷/質量比 是依放電管裏的氣體的本質而定. 英國學家English scientist J.J. Thomson 之後增進了Wien的工作, 他減少了氣體壓力, 製造出了質譜.

The first application of mass spectrometry to the analysis of amino acids and peptides was reported in 1958.[12] Carl-Ove Andersson highlighted the main fragment ions observed in the ionization of methyl esters.[13] Some of the modern techniques of mass spectrometry were devised by Arthur Jeffrey Dempster and F.W. Aston in 1918 and 1919 respectively.

質譜最早被應用到胺基酸及舦的分析的報告在1958. Carl-Ove Andersson 突顯出在 methyl esters 離子化所觀察到的主要碎片離子. 一些現代的質譜技術分別是由 Arthur Jeffrey Dempster and F.W. Aston在 1918 及 1919所設計出來的.

In 1989, half of the Nobel Prize in Physics was awarded to Hans Dehmelt and Wolfgang Paul for the development of the ion trap technique in the 1950s and 1960s. In 2002, the Nobel Prize in Chemistry was awarded to John Bennett Fenn for the development of electrospray ionization (ESI) and Koichi Tanaka for the development of soft laser desorption (SLD) and their application to the ionization of biological macromolecules, especially proteins.[14]

在 1989, 有一半的諾貝爾物理獎頒給了Hans Dehmelt and Wolfgang Paul, 表彰其在1950年代及1960年代的離子捕集技術的發展. 在 2002, 諾貝爾化學獎頒給了John Bennett Fenn, 表彰其在電噴灑離子化(ESI)的發展, 以及頒給了Koichi Tanaka, 表彰其在軟性雷射去吸附(SLD)的發展及其在生物高分子, 尤其是蛋白質的應用.
Simplified example 簡化的範例
Schematics of a simple mass spectrometer with sector type mass analyzer. This one is for the measurement of carbon dioxide isotope ratios (IRMS) as in the carbon-13 urea breath test
一個具有扇型質量分析器的簡單的質譜儀的示意圖. 這個是用於測量碳13尿素呼氣試驗中的二氧化碳同位素比率(IRMS).

The following example describes the operation of a spectrometer mass analyzer, which is of the sector type. (Other analyzer types are treated below.)
以下的範例描述一個質譜的扇型質量分析器的運作 (其他分析器型態在之後處理)

Consider a sample of sodium chloride (table salt). In the ion source, the sample is vaporized (turned into gas) and ionized (transformed into electrically charged particles) into sodium (Na+) and chloride (Cl-) ions. Sodium atoms and ions are monoisotopic, with a mass of about 23 amu.

考慮一個氯化鈉的樣品(食鹽). 在離子源的地方, 樣品被汽化(成為氣體), 且被離子化(轉為帶電粒子的形態)為鈉離子(Na+)及氯離子(Cl-). 鈉原子及離子是單一同位素的, 其質量約為23原子質量單位(amu).


Chloride atoms and ions come in two isotopes with masses of approximately 35 amu (at a natural abundance of about 75 percent) and approximately 37 amu (at a natural abundance of about 25 percent).
氯原子及離子有2個同位素, 其質量約為35amu(自然界含量約百分之75), 以及約為37amu(自然界含量約百分之25).

The analyzer part of the spectrometer contains electric and magnetic fields, which exert forces on ions traveling through these fields. The speed of a charged particle may be increased or decreased while passing through the electric field, and its direction may be altered by the magnetic field.
質譜儀的分析器的含有電及磁場, 施加力量給經過這些力場的離子. 在通過電場時, 帶電粒子的速度可被增加或減少, 而其方向可被磁場改變.


The magnitude of the deflection of the moving ion's trajectory depends on its mass-to-charge ratio. Lighter ions get deflected by the magnetic force more than heavier ions (based on Newton's second law of motion, F = ma). The streams of sorted ions pass from the analyzer to the detector, which records the relative abundance of each ion type. This information is used to determine the chemical element composition of the original sample (i.e. that both sodium and chlorine are present in the sample) and the isotopic composition of its constituents (the ratio of 35Cl to 37Cl).

運動中離子的軌跡偏折的程度大小是依據它的質量/電荷 比值而定. 比較輕的離子被磁力偏折的程度, 比較重的離子多(基於牛頓第二運動定律 F=ma). 此經過排序的離子串流通過分析器到偵檢器, 它記錄了每一個離子型態的相對含量. 此資訊用來決定原始樣品中的化學元素的組成(也就是說, 鈉及氯市存在於樣品中的), 以及組成(元素)的同位素組成(Cl35 與 Cl37 的比例)

Creating ions  產生離子
Main article: Ion source  離子源


The ion source is the part of the mass spectrometer that ionizes the material under analysis (the analyte). The ions are then transported by magnetic or electric fields to the mass analyzer. Techniques for ionization have been key to determining what types of samples can be analyzed by mass spectrometry. Electron ionization and chemical ionization are used for gases and vapors. In chemical ionization sources, the analyte is ionized by chemical ion-molecule reactions during collisions in the source. Two techniques often used with liquid and solid biological samples include electrospray ionization (invented by John Fenn[15]) and matrix-assisted laser desorption/ionization (MALDI, initially developed as a similar technique "Soft Laser Desorption (SLD)" by K. Tanaka[16] for which a Nobel Prize was awarded and as MALDI by M. Karas and F. Hillenkamp[17]).

離子源是質譜儀裏用來使待分析物(樣品)離子化的部份. 然後, 離子會被磁場或電場輸送到質量分析器. 離子化的技術是決定那些型態的樣品能夠被質譜儀分析的關鍵. 電離子化及化學離子化用於氣體及蒸氣. 在化學離子化離子源的, 待分析物是在來源的地方, 經由碰撞的化學離子反應而被離子化的. 有兩項技術經常用於液體及固體生物分子, 包括電噴灑離子化(John Fenn所發明), 以及基質輔助雷射去吸附離子化(MALDI, 起先是由 K. Tanaka 發展的一個類似的技術 "Soft Laser Desorption (SLD)" , 為此給了諾貝爾頒, 以及由 M. Karas and F. Hillenkamp[17] 的MALDI)

Inductively coupled plasma 電感耦合電漿(即等離子體)


Inductively coupled plasma (ICP) sources are used primarily for cation analysis of a wide array of sample types. In this type of Ion Source Technology, a 'flame' of plasma that is electrically neutral overall, but that has had a substantial fraction of its atoms ionized by high temperature, is used to atomize introduced sample molecules and to further strip the outer electrons from those atoms.

電感耦合電漿(ICP)來源主要用於很廣的系列的樣品型態的陽離子的分析. 在這個型態的離子源技術中, 電漿的"火焰"是整體電中性的, 但有很大的一部份是被高溫所離子化的. 此電漿用來將導入的樣品原子化, 且更進一步地將這些原子的外層電子剝離了.

The plasma is usually generated from argon gas, since the first ionization energy of argon atoms is higher than the first of any other elements except He, O, F and Ne, but lower than the second ionization energy of all except the most electropositive metals. The heating is achieved by a radio-frequency current passed through a coil surrounding the plasma.

電漿通常用氬氣製造(Ar), 因為氬原子的第一離子化能, 比任何其他原素的第一(離子化能)還高, 除了He, O, F and Ne 以外, 但比所有(原素)的第二(離子化能)還低, 除了最電陽性的金屬之外. 加熱的方式是以一個射頻電流通過一個環繞電漿的線圈.

Other ionization techniques(其它離子化的技術) Others include glow discharge, field desorption (FD), fast atom bombardment (FAB), thermospray, desorption/ionization on silicon (DIOS), Direct Analysis in Real Time (DART), atmospheric pressure chemical ionization (APCI), secondary ion mass spectrometry (SIMS), spark ionization and thermal ionization (TIMS).[18] Ion attachment ionization is an ionization technique that allows for fragmentation free analysis.

其它包括輝光放電, 場效應去吸附, 快原子轟擊(FAB), 熱噴灑, 在silicon上的去吸附或離子化(DIOS), 真時直接分析(DART), 大氣壓化學離子化(APCI), 二度離子質譜(SIMS), 火花離子化及熱離子化(TIMS). 離子附著離子化是一種可以達到無碎片產生的離子化技術.
Hard Ionisation & Soft Ionisation 硬離子化與軟離子化
In mass spectrometry (MS), ionisation (or ionization) refers to the production of gas phase ions suitable for resolution in the mass analyser or mass filter. Ionisation occurs in the instrument ion source.
There are a plethora of ion sources available, each has advantages and disadvantages for particular applications. For example, Electron Impact (EI) ionisation gives a high degree of fragmentation, yielding highly detailed mass spectra which when skilfully analysed can provide important information for structural eluciation/characterisation and facilitate identification of unknown compounds by comparison to mass spectral libraries obtained under identical operating conditions.


在質譜(MS)裏, 離子化指的是適用於以質量分析器及質量過濾器解析的氣相離子的製造. 離子化發生在儀器的離子源.
有太多的離子源可以取得, 每一種都有特定應用方面的優缺點. 例如, 電子碰撞(EI)離子化得到高程度的碎片, 產出很詳細的質譜, 經過很有技巧地分析後, 能提供用於辨識結構特徵的重要訊息, 經由比較相同操作條件下所得到的質普資料庫, 得到未知化合物的確認.

However, EI is not suitable for coupling to HPLC, i.e. LC-MS, since at atmospheric pressure, the filaments used to generate electrons burn out rapidly. Thus EI is coupled predominantly with GC, i.e. GC-MS, where the entire system is under high vacuum.

無論如何, 電子碰撞(EI)不適合聯結到HPLC, 即LC-MS,因為在大氣壓下, 產生電子的燈絲很快就燒掉了. 因此, EI 主要是聯結GC, 即GC-MS, 因其整個系統是處於高度真空的中.


Ionisation techniques can be described as belonging to one of the following categories: Hard Ionisation Soft Ionisation Hard Ionisation Hard ionisation techniques are processes which impart high quantities of residual energy in the subject molecule invoking large degrees of fragmentation (i.e. the systematic rupturing of bonds acts to remove the excess energy, restoring stability to the resulting ion). Resultant ions tend to have m/z lower than the molecular mass (other than in the case of proton transfer and not including isotope peaks). The most common example of hard ionisation is Electron Impact Ionisation (EI).

離子化技術能以屬於以下的類型之一來描述: 硬離子化 軟離子化 硬離子化技術是置入大量殘留能量在目標分子, 使能夠達到很大程度的碎片化的程序. (也就是說, 鍵結的系統性裂解, 用以移除過多的能量, 使產生的離子保持在穩定的狀態). 使產生的離子傾向於具有比分子質量還低的質量/電荷比, m/z. (質子轉移的營情況除外, 以及不包括同為素成份峰). 硬離子化最常見的例子是電子碰撞離子化(EI).

Soft Ionisation Soft ionisation refers to the processes which impart very little residual energy onto the subject molecule and as such result in very little fragmentation. Examples include: Fast atom bombardment (FAB) Chemical ionisation (CI) Atmospheric Pressure Chemical Ionisation (APCI) Electrospray Ionisation (ESI) Matrix Assisted Laser Desorption Ionisation (MALDI)

軟離子化硬離子化技術指的是置入很少過剩的能量在目標分子, 使能產生很小的碎片化的程序. 範例包括: 快原子轟擊(FAB) 化學離子化(CI) 大氣壓化學離子化(APCI) 電噴灑離子化(ESI) 基質輔助雷射去吸附離子化(MALDI)
Mass selection 質量的選擇

Mass analyzers separate the ions according to their mass-to-charge ratio. The following two laws govern the dynamics of charged particles in electric and magnetic fields in vacuum:
F = Q (E + v x B) (Lorentz force law);
F=ma (Newton's second law of motion in non-relativistic case, i.e. valid only at ion velocity much lower than the speed of light).

Here F is the force applied to the ion, m is the mass of the ion, a is the acceleration, Q is the ion charge, E is the electric field, and v × B is the vector cross product of the ion velocity and the magnetic field.


質量分析器根據離子的質量/電荷 比值來進行分離. 以下兩個定律主窄了帶電粒子在真空電場內的動力學.
F = Q (E + v x B) (洛倫茲力學定律);
F=ma (定律第二運動定律在非相對論的情況, 有就是只有在離子速度遠低於光速時才成立).
將上述2兩施力表述式連接取代得出:
(m/Q)a = E+ v x B.
在此, F是加在離子的力, m 是離子的質量, a 是加速度, Q是電荷, E 是電場, 以及 v x B 是離子速度與磁場的向量外積.


This differential equation is the classic equation of motion for charged particles.
Together with the particle's initial conditions, it completely determines the particle's motion in space and time in terms of m/Q.
Thus mass spectrometers could be thought of as "mass-to-charge spectrometers".
When presenting data, it is common to use the (officially) dimensionless m/z, where z is the number of elementary charges (e) on the ion (z=Q/e). This quantity, although it is informally called the mass-to-charge ratio, more accurately speaking represents the ratio of the mass number and the charge number, z.


這個微分方程式是帶電粒子運動的古電方程式. 加上了粒子的初始化條件, 它以質量/電荷比值的項目, 完全地決定了粒子在空間及時間中的運動. 質量儀可以被想成像是"質量 對電荷 的光譜儀".
在作數據的表達時, 它常用到(官方的)無因次的單位 m/z, 其中z是離子的基本電荷(e)的數目(z=Q/e). 這個數量, 雖然非正式地被稱為 質量/電荷 比質, 更準確地說, 是代表質量/基本電荷數目 比值.


There are many types of mass analyzers, using either static or dynamic fields, and magnetic or electric fields, but all operate according to the above differential equation.
Each analyzer type has its strengths and weaknesses. Many mass spectrometers use two or more mass analyzers for tandem mass spectrometry (MS/MS).
In addition to the more common mass analyzers listed below, there are others designed for special situations.


質量分析器的型式很多, 使用靜態的或動態的力場, 及磁場或電場, 但都是依照上述的微分方程式運作.
每個質量分析器有其強項與入弱點. 很多質譜儀使用2個或更多質量分析器做為串連質譜(MS/MS).
除了以下列出的常見質量分析器以外, 有其他用於特別情境的設計.


There are several important analyser characteristics.
The mass resolving power is the measure of the ability to distinguish two peaks of slightly different m/z.
The mass accuracy is the ratio of the m/z measurement error to the true m/z.
Mass accuracy is usually measured in ppm or milli mass units.
The mass range is the range of m/z amenable to analysis by a given analyzer.
The linear dynamic range is the range over which ion signal is linear with analyte concentration.
Speed refers to the time frame of the experiment and ultimately is used to determine the number of spectra per unit time that can be generated.


質量分析器有幾個重要特徵.
質量解析的能力的量測, 是以能夠辨別出只有輕微質量/電荷比值(m/z)差異的2個成份峰的能力.
質量測量的準確度是量測所得的m/z與真實的m/z 的比值.
質量測量的準確度通常是以ppm 或是milli mass units作為其量測單位.
質量的範圍是適合某一個質量分析器分析的 m/z 的範圍.
線性範圍是離子(強度)訊號與分析物濃度程線性關係的範圍.
速度指的是實驗過程的時間框架, 終極目的是用來測定單為時間所能產生的譜圖數.


Sector instruments
For more details on this topic, see sector instrument.

A sector field mass analyzer uses an electric and/or magnetic field to affect the path and/or velocity of the charged particles in some way.
As shown above, sector instruments bend the trajectories of the ions as they pass through the mass analyzer, according to their mass-to-charge ratios, deflecting the more charged and faster-moving, lighter ions more. The analyzer can be used to select a narrow range of m/z or to scan through a range of m/z to catalog the ions present.[19]

扇型儀器
更多主題的詳細內容, 請見 扇型儀器
一個扇型力場的質量分析器以電場或磁場的某種方式的來影響帶電粒子的路徑或速度.

如上所示, 當離子通過質量分析器時, 扇型儀依據質量/電荷 比值, 彎曲了離子的軌跡, 使帶電較多的, 輕些的離子偏折更多. 此質量分析器能用於選別一個狹窄m/z範圍或掃描過一個m/z範圍以得出存在離子的目錄.


Time-of-flight
For more details on this topic, see time-of-flight mass spectrometry.

The time-of-flight (TOF) analyzer uses an electric field to accelerate the ions through the same potential, and then measures the time they take to reach the detector.
If the particles all have the same charge, the kinetic energies will be identical, and their velocities will depend only on their masses.
Lighter ions will reach the detector first.[20]

時間飛行
更多主題的詳細內容, 請見 時間飛行

時間飛行(TOF)質量分析器用電場及相同的電壓以加速離子, 然後量測它們到達偵檢器的時間. 如果全部的粒子有同樣的電荷, 其動能將是相同的, 而且它們的速度將取決於它們的質量. 較輕的離子會先到達偵檢器.


Quadrupole mass filter
For more details on this topic, see Quadrupole mass analyzer.

Quadrupole mass analyzers use oscillating electrical fields to selectively stabilize or destabilize the paths of ions passing through a radio frequency (RF) quadrupole field created between 4 parallel rods.
Only the ions in a certain range of mass/charge ratio are passed through the system at any time, but changes to the potentials on the rods allow a wide range of m/z values to be swept rapidly, either continuously or in a succession of discrete hops.
A quadrupole mass analyzer acts as a mass-selective filter and is closely related to the quadrupole ion trap, particularly the linear quadrupole ion trap except that it is designed to pass the untrapped ions rather than collect the trapped ones, and is for that reason referred to as a transmission quadrupole.

四極桿質量過濾器
更多主題的詳細內容, 請見 四極桿質量過濾器

四極桿質量分析器 使用震盪電場以選擇性地穩定或去穩定離子通過的路徑, 此路徑是在4根平行棒之間產生的射頻(RF)四極場.
在任何時間裏, 只有在一定質量/電荷比值(m/z)範圍內的離子通過這個系統, 而改變極桿之間的電位可允許很寬廣的(m/z)範圍值被快速掃過, 連續地或不連續地接續跳躍均可.
做為一種質量選擇過濾器, 四極桿質量分析器 與 四極桿離子阱有很近相關性, 特別是線性四極桿離子阱. 差別在於的是它是設計要讓為被捕捉住的離子通過, 而不是要收集被捕捉住的, 也因此, 被指稱為穿透式四極桿.


A common variation of the transmission quadrupole is the triple quadrupole mass spectrometer.
The “triple quad” has three consecutive quadrupole stages, the first acting as a mass filter to transmit a particular incoming ion to the second quadrupole, a collision chamber, wherein that ion can be broken into fragments.
The third quadrupole also acts as a mass filter, to transmit a particular fragment ion to the detector.
If a quadrupole is made to rapidly and repetitively cycle through a range of mass filter settings, full spectra can be reported.
Likewise, a triple quad can be made to perform various scan types characteristic of tandem mass spectrometry.


穿透式四極桿常見的變異體為三重四極桿質譜儀.
triple quad”有三個接續的四極桿階段. 第一個當做質量過濾器使某個特定的來源離子穿過到第二個四極桿(一個碰撞室, 在這裏面離子能被破碎成碎片), 第三個四極桿也是質量過濾器的作用, 用以通過特定的離子碎片到偵檢器.
如果一個四極桿被做成要快速且重複地在一個範圍的質量分析設定循環操作, 即能得到全部的譜圖.
類似相同地, 三重四極桿質譜儀也能被製成能夠進行串連質譜儀的不同的掃描型態特徵.


Ion traps
Three-dimensional quadrupole ion trap
For more details on this topic, see quadrupole ion trap.

The quadrupole ion trap works on the same physical principles as the quadrupole mass analyzer, but the ions are trapped and sequentially ejected. 
Ions are trapped in a mainly quadrupole RF field, in a space defined by a ring electrode (usually connected to the main RF potential) between two endcap electrodes (typically connected to DC or auxiliary AC potentials). The sample is ionized either internally (e.g. with an electron or laser beam), or externally, in which case the ions are often introduced through an aperture in an endcap electrode.


離子阱
三維四極桿離子阱
更多主題的詳細內容, 請見 四極桿離子阱

四極桿離子阱工作方式與四極桿質量分析器是相同的, 但離子是被捕捉住且依續被噴出.
離子主要是被捕集在四極桿的射頻場域內, 此場域空間是由一個介於兩端蓋電極的環狀電極所定出. (環狀電極通常連接到主FR電位, 兩端蓋電極通常連接到 DC 或 府助AC 電位).
樣品在內部離子化(例如用一個電子束或雷射光束) 或在外部, 在這情況下(在外部) 離子經常是經由端蓋電極的一個針孔導入的.


There are many mass/charge separation and isolation methods but the most commonly used is the mass instability mode in which the RF potential is ramped so that the orbit of ions with a mass a > b are stable while ions with mass b become unstable and are ejected on the z-axis onto a detector.
There are also non-destructive analysis methods. Ions may also be ejected by the resonance excitation method, whereby a supplemental oscillatory excitation voltage is applied to the endcap electrodes, and the trapping voltage amplitude and/or excitation voltage frequency is varied to bring ions into a resonance condition in order of their mass/charge ratio.[21][22]
The cylindrical ion trap mass spectrometer is a derivative of the quadrupole ion trap mass spectrometer.


有許多質量/電荷分離和隔離的方法, 但最通常的是質量不穩定模式, 在這模式裏, 電位被進行斜坡式的改變, 以使在軌道內質量a(較b大)的離子是穩定的, 而質量b的離子變成不穩定, 因而被自Z軸噴出到偵檢器上.
另也有非破壞式的分析方法. 離子也能以共振激發的方法被噴出, 在此, 一個補充的振盪激發電位被施加到端蓋電極, 且依據離子的質量/電荷比值順序, 變動捕捉電位/或激發電位頻率, 依序將離子帶入一共振條件.

氣缸式離子阱質譜儀是四極桿離子阱質譜儀的一個衍生.


Linear quadrupole ion trap

A linear quadrupole ion trap is similar to a quadrupole ion trap, but it traps ions in a two dimensional quadrupole field, instead of a three-dimensional quadrupole field as in a 3D quadrupole ion trap.
Thermo Fisher's LTQ ("linear trap quadrupole") is an example of the linear ion trap.[23]

A toroidal ion trap can be visualized as a linear quadrupole curved around and connected at the ends or as a cross section of a 3D ion trap rotated on edge to form the toroid, donut shaped trap.
The trap can store large volumes of ions by distributing them throughout the ring-like trap structure.
This toroidal shaped trap is a configuration that allows the increased miniaturization of an ion trap mass analyzer.
Additionally all ions are stored in the same trapping field and ejected together simplifying detection that can be complicated with array configurations due to variations in detector alignment and machining of the arrays.[24]


線性四極桿離子阱

線性四極桿離子阱類似於四極桿離子阱, 但它把離子補捉在二維的四極桿場域, 而不是像是3D四極桿離子阱的三維的四極桿場域.
Thermo Fisher's LTQ ("linear trap quadrupole") 就是一個線性四極桿離子阱的範例.
環形的離子阱能被視為 灣曲且兩端連接的 線性四極桿, 或是是選旋轉3D離子阱的邊緣, 形成一磁環, 甜甜全圈形狀的補捉器. 此補捉器將離子遍佈到環狀補捉結構, 能儲存大量的離子.
此外, 非本方式設計的偵檢器對準及陣列的機械加工的變異, 使得陣列的組態讓偵檢器設計複雜化, 而本方式設計, 全部的離子是被儲存在相同的補捉場域內且被一起噴出, 因而簡化偵檢器.


Orbitrap
For more details on this topic, see Orbitrap.

These are similar to Fourier transform ion cyclotron resonance mass spectrometers (see text below).
Ions are electrostatically trapped in an orbit around a central, spindle shaped electrode.
The electrode confines the ions so that they both orbit around the central electrode and oscillate back and forth along the central electrode's long axis. 
This oscillation generates an image current in the detector plates which is recorded by the instrument.
The frequencies of these image currents depend on the mass to charge ratios of the ions.
Mass spectra are obtained by Fourier transformation of the recorded image currents.
Orbitraps have a high mass accuracy, high sensitivity and a good dynamic range.[25]

軌道補捉器(阱)
更多主題的詳細內容, 請見 軌道補捉器(阱)

這些類似於 傅利葉轉換離子迴旋加速共振質譜儀(見後文).
離子是靜態地被補捉在一個軌道, 圍繞在一個中間的, 槳葉形狀的電極. 此電極圍住了離子, 使它們圍繞著中間電極運行, 且延著中間電極長軸方向來回振盪.
此振盪在偵檢器的偵測板上產生一個被儀器記錄下來的鏡像電流. 此鏡像電流的頻率相依於離子的質量/電荷 比值.
質譜圖是由所記錄的鏡像電流經過傅利葉轉換所得到.


Fourier transform ion cyclotron resonance
For more details on this topic, see Fourier transform mass spectrometry.

Fourier transform mass spectrometry (FTMS), or more precisely Fourier transform ion cyclotron resonance MS, measures mass by detecting the image current produced by ions cyclotroning in the presence of a magnetic field.
Instead of measuring the deflection of ions with a detector such as an electron multiplier, the ions are injected into a Penning trap (a static electric/magnetic ion trap) where they effectively form part of a circuit.
Detectors at fixed positions in space measure the electrical signal of ions which pass near them over time, producing a periodic signal.
Since the frequency of an ion's cycling is determined by its mass to charge ratio, this can be deconvoluted by performing a Fourier transform on the signal.
FTMS has the advantage of high sensitivity (since each ion is "counted" more than once) and much higher resolution and thus precision.[26][27]

Ion cyclotron resonance (ICR) is an older mass analysis technique similar to FTMS except that ions are detected with a traditional detector. Ions trapped in a Penning trap are excited by an RF electric field until they impact the wall of the trap, where the detector is located.
Ions of different mass are resolved according to impact time.


傅利葉轉換離子迴旋加速共振
更多主題的詳細內容, 請見 傅利葉轉換質譜儀

傅利葉轉換質譜儀(FTMS), 或更精準地, 傅利葉轉換離子迴旋加速共振MS, 以偵測離子在磁場存在下的迴旋加速所產生的鏡像電流來量測質量.
不是以像電子倍增器的偵測去量測離子的偏折, 而是離子被噴入個"潘寧陷井" (一個靜態的電/磁離子阱), 在此它們很有效地形成電路的一部份.
在空間中固定位置的偵檢器, 長時間量測通過他附近的離子的電訊號, 產生了一種週期性的訊號. 由於離子的迴旋加速的頻率是有由其質量/電荷 比值所決定, 因此可經由進行訊號的傅利葉轉換作解卷積.
FTMS 具有高靈敏度(因為離子是被重複"計算"一次以上), 及更高的解析度精確度.

離子迴旋加速共振(ICR) 是一種舊一些的質譜分析技術, 除了離子是用傳統的偵檢器檢測以外, 相似於FTMS. 被補捉在"潘寧陷井"的離子, 被以射頻電場激發, 直到它們撞擊到補捉器的器壁, 偵檢器在這裏.
不同質量的離子是依據撞擊時間被解析.
Detectors
Tandem mass spectrometry

Common mass spectrometer configurations and techniques Chromatographic techniques combined with mass spectrometry
LC/MS or LC-MS, GC/MS or GC-MS
Data and analysis Applications
太陽系分析基礎開發工作室(ABDC, The Analytical Based Development Center)
營業: 407台中市西屯區福順路641號5樓
        (中科園區&台中工業區)
研發: 436 台中市清水區高北里護岸路140-7號
        (高美濕地&媽祖文化園區)
Email:  service@chromnet.net
04-2462 8085, FAX:04-2256 9743
The Analytical Based Development Center
Zipcode:407
5th Floor, NO.641, Fu Shun Road, Shi-Tuen District , Taichung City, Taiwan, R.O.C.
886-4-24628085, FAX:886-4-22569743
Email:  service@chromnet.net

LINE:service.abdc, SKYPE: skypeabdc, QQ: qqabdc(2220487599)
 
http://www.chromnet.net/  
版權所有, 請勿翻印使用, 歡迎正常使用的連結.

台中 伴手禮 文化節 禮物 母親節 端午節 高美濕地 佳節倍思親,好禮表孝心, 父母的健康,就是子女的孝心. 佳節好禮, WWW.chromnet.net 穩達F3靈芝多醣體在使用中可持續保有可視圖文的肥皂 (Soaps with Sustained Visible Characters and Graphics while applying) 一.特點, 二.可客製化設計三.訂購方式特點: (專利申請中:101150476, 102105651)  1.含有金玉良言及圖案 2.一直洗,一直洗,仍可看得到圖文 3.可多層組成一組詩詞短句本項發明的目的在於提供各種內含有圖案或文字的肥皂, 此圖案或文字具有深度方向的厚度, 以使得在肥皂的在使用過程中, 仍可持續保有可以被看到的圖案或文字. The purpose of this invention is to provide soaps with characters and graphics included. The included characters and graphics have their depths in the thickness direction to sustain their visibilities while applying the soaps. 現有的各種肥皂所內含的圖案或文字, 主要都以表面淺層凹版或凸版方式製作, 在短暫的使用後, 肥皂表面的圖案或文字即被消耗而看不見了, 因而未能在其使用過程中持續保有可以被看到的圖案或文字. 本項發明的目的在於提供各種內含有圖案或文字的肥皂, 此圖案或文字具有深度方向的厚度, 以使得在肥皂的在使用過程中, 仍可持續保有可以被看到的圖案或文字.本系統發明的重點在於其應用方式, 組構型態及製作, 所用零組件能達到所須功能即可. 利用各種常見或特定的肥皂的材料及色料, 製作含有圖案或文字的肥皂,此圖案或文字具有深度方向的厚度. 可客製化設計: 我們可以依據您們的指定,設計所須要的"深度圖文耐用皂", 包括: 皂體尺寸,圖文內容,皂體顏色,圖文顏色,香精成份,單一皂體包裝材質及印刷內容,多皂體禮盒構造材質及印刷內容等... "深度圖文耐用皂" 是可以重疊多層,形成一個含有多層文字圖案的耐用皂,其特點是可在一個多層文字圖案耐用皂裏表達出一篇簡短的古詩,現代詩,對聯或短句等,是我們的專利主要訴求之一.  另我們也可有涵蓋到固體芳香劑及馬桶小便斗除臭劑的應用上,使得芳香劑及馬桶小便斗除臭劑上可以有不同顏色的文字或線條圖案,如"早安"或"請對準","花朵"或"蒼蠅"(圖案),深度都是與固體芳香劑及馬桶小便斗除臭劑的厚度一樣,在用完以前就可以一直被看到,這也是既實用有創新的應用. 客製化的設計, 可以增進客戶的在創新服務層面的評價, 使得產品及服務內容更具有吸引力. 訂購方式: 請至各子項目查看各現有產品訂價,確定所需品項,香精種類及數量之後,請直接以EMAIL連繫,經我們確定可交件日期後,即可付款訂購. 常見香精有:香茅,艾草,薰衣草,樟樹,茶樹,玫瑰麝香,甜菊,月桂,... 運費及運送方式:一次購滿500元免運費,500元以下酌收50-80元運費.以郵局包裹方式運送.  匯款資訊:台中市清水區農會 活期存款帳號名稱:林坤益 (+) 太陽系分析基礎開發中心, 帳號: 45000100033625 通匯代碼: 9544505 NOTE:1.香精種類很多,部份香精對特定體質具有刺激性或過敏性,一般建議先少量短期使用,以確保適用. NOTE:2.不同成份的香精成本差距相當大(5-20倍),在您確認訂購時,會適度酌收高單價香精的成本費用. NOTE:3.不加香精也是種很好的選項,完全不用顧慮刺激性或過敏性問題,但使用時會有甘油皂基的原本不香的味道.能夠體認習慣了也是很好的選項. NOTE4:客製化部份, 煩均以email連繫及確認需求及可交件日期,     良言一句三冬暖(星雲--遠見雜誌)  語言是思想和觀念的表象, 用來聯繫人心的般若風光. 若能時時慎之於口, 與他人共享, 陽光,花朵.淨水般的話語, 人生必然豐美... (http://www.gvm.com.tw/Boardcontent_4574.html) 多年以前,曾經在一篇文章裡,讀到這麼一句話:「語言,要像陽光、花朵、淨水。」當時深深感到十分受用,於是謹記心田,時刻反省,隨著年歲的增長,益發覺得其中意味深長。 http://www.sfes.tc.edu.tw/index.asp(上楓國小好話實踐) http://www.sfes.tc.edu.tw/index.asp(上楓國小唐詩河洛語線上教學)       節氣指二十四時節和氣候,是中國古代訂立的一種用來指導農事的補充曆法,... http://zh.wikipedia.org/wiki/节气二十四節氣(農委會)http://www.coa.gov.tw/view.php?catid=284 今日星象、行星動向、節氣 http://web2.nmns.edu.tw/constellation/home.php AEEA 天文教育資訊網 http://aeea.nmns.edu.tw/ 太陽系的前世今生, 影像提供:NASA/ESA,陳輝樺(NMNS) http://aeea.nmns.edu.tw/index1.html   大地藏無盡, 勤勞資有生, 念哉斯意厚,努力事春耕. 一.特點,二.可客製化設計,三.訂購方式   大地藏無盡  念哉斯意厚 勤勞資有生 努力事春耕298元/組(320g) 誠歡迎有天文學,民俗學及相關的教育及創新構想的原創者及推廣者,與我們密切合作 !    氨基酸分子模型系列(19種常見氨基酸) 由丙氨酸的基礎結構可研衍生出各種常見氨基酸分子結構一.特點,二.可客製化設計,三.訂購方式   分子球 89元/個(80g)    丙安酸(Alanine)  丙氨酸 369元/個(330g) 麩氨酸(圓柱) 469元/個(430g) 誠歡迎有科學教育創新構想的原創者及推廣者,與我們密切合作 ! RainbowDash 及UNLIGHT 是最經點的動漫符號之一網路搜尋即有豐富的資訊. Ranbow Dash 動畫My Little Pony:Friendship is Magic 之主角群之一 Cutie mark的圖案為打著彩虹閃電的雲在故事中代表的精神為"忠誠" UNLIGHT FACEBOOK網頁遊戲以故事為中心的對戰型卡牌養成遊戲玩家人數突破30萬人   好香皂結合好男人及撿肥皂的梗,並將其實體化梗的詳細資料有請 網路搜尋   誠歡迎有文化及新構想的原創者及推廣者,與我們密切合作. 先民從大陸移居台灣,渡過黑水溝,也把馬祖信仰帶來台灣。媽祖信仰起源於西元10世紀的宋朝,幾乎每個台灣人都耳熟能詳福建莆田湄洲林默娘傳說,為了指引出海的父兄返航而犧牲自己,後來成為漁民信仰的「航海女神」。 一.特點,二.可客製化設計,三.訂購方式   保庇 89元/個(80g)     恭賀新喜_1 79元/個(30g)      金鎖片 79元/個(80g) 元寶錢幣 79元/個(80g)   風調雨順 99元/個(80g) 國泰民安_2 99元/個(80g) 富貴吉祥_1 99元/個(80g) 年年有餘_1 79元/個(80g) 年年有餘_3 99元/個(80g) 誠歡迎有宗教學,民俗學及相關的教育及創新構想的原創者及推廣者,與我們密切合作 ! 牛牽到北京 還是牛,.. 一.特點,二.可客製化設計,三.訂購方式    牛牽到北京   牛牽到北京還是牛 188元/組(160g) 還是牛 台灣諺語_動物篇 http://163.21.2.41/t128/chinesepassport/animals.htm 動物之台灣諺語 www.taiwan123.com.tw/local/a_index.htm 誠歡迎有趣味文學相關的教育及創新構想的原創者及推廣者,與我們密切合作 ! 沒辦法再更傳統了特出的文化產品, 如沐春風粿模經典(雕:餅印.粿印.糕印.糖印) 粿模_財子壽中草藥種苗很專業的中草藥種苗來源, 值得珍藏綬草沒辦法再更先進了用最先進的技術, 提供最優化的生活營養保健美肌保養居家潔身居家潔身深度圖文耐用手工皂唯一可以讓我們的日常生活充滿文學品味的手工皂, 具有無可替代的專利特點發現金玉良言系列良言一句三冬暖媽祖(風調雨順, 國泰民安, 保庇每一個手工皂都有一句媽祖的提示良言, 直到用完前都還能看得見節氣(驚執:大地藏無盡, 勤勞資有生, 念哉斯意厚, 努力事春耕清明節母親節端午節畢業紀念四書, 五經經典文學系列, 詩, 詞, 曲勵志追思永懷親恩祝賀五世其昌情意與關懷 LOVE, WISH, 平安文具禮頻贈品不只是高CP值,還特別具有創新及創意科教禮贈用品結合科學, 教育, 文創, 既有趣又有豐富的科學人文內涵天文科學星座觀測, 觀測工具發現生命的起源及意義考古人類學探索, 學習, 驚奇, 有趣 ... 追思(城鄉差距與世代正義) 記憶伴隨著歲月, 從鄉村到城市, 一切是否留下寶貴的智慧, 或是只是無限的追思 ! 小時候, 母親曾說:"如果我們這邊有一條較直的大路直接到清水鎮上就好了" 這事實上也是我們鄉下人共同的期望與夢想. 記得每年農曆10月13前後, 母親難得年回甲南娘家一次 , 我們總是既期待又害羞. 回甲南娘家其實不遠, 走路只要約50-60分鐘 , 不過幾十年來一直也沒有公車... 有時後總是在想, 這人類的社會到底是怎麼回事 ? 人口總是往都市集中, 留在鄉下卻是一些無法被提起的記憶 ? 因此, 容我們有一點能力與機會, 來訴說我們的所見所知與所感 , 也希望這一切是留下來的不只是無限的追思.