Most commercial icpms systems employ a quadrupole mass spectrometer which rapidly scans the mass range. Electric recording with a doublefocusing laser mass spectrometer. A hewlettpackard 5710a gas chromatograph interfaced to a vg micromass 7070f doublefocusing mass spectrometer was used. A new variable dispersion doublefocusing plasma mass. Doublefocusing mass spectrometer doublefocusing mass spectrograph an instrument which uses both direction and velocity focusing, and therefore an ion beam initially diverging in direction and containing ions of different kinetic energies is separated into beams according to the quotient mass charge, these beams being focused on to a photographic plate or film. The doublefocusing angle and energy magnetic instrument ionizes neutral species, collects the ions of he, n, o, h,o, n, and 0, in fixed position collectors, commu. Low resolution, accurate mass measurements were made with a combined eicl source. A sector instrument is a general term for a class of mass spectrometer that uses a static electric or magnetic sector or some combination of the two separately in space as a mass analyzer. A revolutionary doublefocusing mass spectrometer is constructed and the focusing property investigated. There is provided a mass spectrometer having at least three analyser sectors of the electrostatic or magnetic types, at least one sector being of the electrostatic type and at least one further sector being of the magnetic type. Block diagram of a mass spectrometer ion source mass analyzer detector high vacuum sample in computer 400 600 800 1200 1400 1600 1800mz 0 20 40 60 80 100 relative abundance mass. Mass spectrometry double focusing mass spectrometer.
The spectrometer includes a focusing sector array having at least three analyzer sectors, the sectors of the array being dimensioned and positioned so as to cooperate. A double focusing mass spectrometer having a combination of an electrical and a magnetic field for directional and velocity forming comprising a combination of a wien filter and of a sector magnet, characterized in that the wien filter 10 and the sector magnet 11 possess a common magnet 32 to 37. Double focusing in general is achieved when ions emerging from an ion. High resolution mass spectra were obtained on a vg 70250s double focusing mass spectrometer at 70 ev or on an abisciex qstar mass spectrometer with esisource, msms and accurate mass. A simple doublefocusing mass spectrometer sciencedirect. In this work, we compare the spiraltoftof with the mstation four sector tandem double focusing mass spectrometer using the same sample for msms analysis. Current labscale mass spectrometers however, usually weigh hundreds of pounds and can cost on the range from thousands to millions of dollars. Hall consolidated systems corporation introduction study of. In the prism, light is separated into its component wavelengths which are then detected with an optical receptor, such as. Mstation doublefocusing magnetic sector mass spectrometer. Doublefocusing mass spectrometer mass spectrometry terms. The choice of mass analyzer should be based upon the application. It is the highest performance ms ever built for target compound analysis, and the first completely new double focusing instrument of its class in more than 15 years. Abstract the requirements, configuration and characteristics of the mass spectrometer system used in the explorer xvii satellite are described.
In this paper, ion optical investigations for the double focusing mass spectrometers of reverse combination are presented. A new ion optical system of the miniature double focusing mass spectrograph was designed by trio 2. Mass spectrometry is an analytical technique in which samples are ionized into charged molecules and ratio of their mass tocharge mz can be measured. The maximum radius of curvature of ions in the magnetic analyzer is 9. Us4924090a double focusing mass spectrometer and msms. The instrument takes advantage of modern ccd technology combined with the latest generation of readout electronics. Instrumentation of mass analyzerlink double focusing mass analyzer, instrumentation of mass. It yields the highest degree of accuracy and precision 0. For example, double focusing magnetic sector mass filters were developed by.
A doublefocusing magnetic mass spectrometer for satellite use. A mass spectrometer that separates ions by passing them between four metallic cylinders to which are applied direct current and oscillating electric fields. Development of a miniature double focusing mass spectrograph. Supporting information signal amplification for imaging mass. A mass spectrometer which has magnetic and electric analysers combined in a specified geometrical configuration in order to accomplish both direction and velocity focusing of an ion beam from an ion source. In order to provide a compact and constructionally. Double focusing mass analyzer, instrumentation of mass spectrometry, mass spectrometry, magnetic field deflection mass analyser, time of flight mass analyser, quadrupole mass analyser, dr. Usre40632e1 mass spectrometer system including a double ion. Similarly, in a mass spectrometer the generated ions are separated in the mass analyzer, digitized and detected by an ion detector. Highresolution mass spectrometry hrms and fab spectra were. Based on magnetic sector technology, the dfs magnetic sector gchrms performs dioxin and pops routine analysis, delivering ultimate confidence, no matter the.
The ion optical system was designed to satisfy the double focusing along a straight line being at a distance from the exit fringe of the magnetic sector to employ a focal plane detector. Boron isotope ratio b measurements in water framework. Pdf a double focusing mass spectrometer for geochronology. Fragment ions produced from precursor ions of a certain ionic species are introduced into a uniform electric field. The mstation is capable of achieving a resolving power of 60,000 or greater at 10% valley. Mass spectrometrymass spectrometry instrument having a. A popular combination of these sectors has been the beb magneticelectricmagnetic. The focusing nature for the instruments of direct combination has been discussed previously 5,6. The instrument consists of an electric parallel plate. The ability to do low resolution, accurate mass measurements made possible a rapid scan function necessary for capillary column gas. Reaction products of aquatic humic substances with chlorine.
Hall consolidated systems corporation introduction study of the earths upper atmosphere by direct measurement techniques has been a realizable and productive possibility since shortly after world war 11. A double focusing magnetic mass spectrometer for satellite use by carl a. It is designed to allow users to introduce gases, liquids and vapors from solid samples into the instrument for analysis. Spectro ms is a double focusing sector field icpms inductively coupled plasma mass spectrometer, which measures mass range for inorganic mass spectrometry. Field portable gas chromatograph mass spectrometers. Mass analyzer must posses the following characteristics. Low resolution, accurate mass measurements were made with a. Vanhaecke, laser ablationinductively coupled plasmamass spectrometry using a doublefocusing sector field mass spectrometer of mattauchherzog geometry. Block diagram of a mass spectrometer ion source mass analyzer detector high vacuum sample in computer 400 600 800 1200 1400 1600 1800mz 0 20 40 60 80 100 relative abundance mass analyzer activation or reaction tandem mass spectrometry or msms. In order to provide a compact and constructionally simple arrangement, it is proposed that a common magnet is used for the wien filter 10 and the sector magnet 11. Development of miniature doublefocusing mass spectrograph.
The dfs has all the best performance of a magnetic sector ms, but it neither looks nor feels like one. Separation of masses in a mass spectrometer jeol produces doublefocusing mass spectrometers that have analyzers with both an electric sector and a magnetic sector. To improve the operating characteristics of an ma2 doublefocusing laser mass spectrometer or similar ones, a complex for electric recording of ion currents is developed, which. Doublefocusing mass spectrometers of short path length. The instrument consists of an electric parallel plate condenser 6. There is described an interface for delivering ions generated in an ion source into a mass analyzer in a chamber under vacuum pressure. The basic principles of mass separation in isotope measurements are based on the kinetic energy equation, e. Doublefocusing mass spectrometer definition of double.
Miniature doublefocusing mass spectrometer design the design of the miniature mass analyzer is based on the mass separation and focusing capabilities of a 90 cylindrical doublefocusing mass. In particular, the interface employs two consecutive ion guides. Intermediates 1 and 2 were prepared according to a procedure reported previously1 while 3. Based on magnetic sector technology, the dfs magnetic sector gchrms performs dioxin and pops routine analysis, delivering ultimate confidence, no matter the sample type or matrix. Mass spectrometry is an analytical technique in which samples are ionized into charged molecules and ratio of their masstocharge mz can be measured. The angle of the electrostatic sector is 90 and that of the magnetic sector 60. The performance characteristics of a double focusing mass spectrometer designed specifically for geochronology are described. Vertical or z focusing in the analyser is achieved using both a long focal length lens before the. Between the ion optical system and the detection system is a doublefocusing mass spectrometer that provides mass separation. Thus, monoenergetic ions travel with velocities that are proportional to their mass. An instrument which uses both direction and velocity focusing, and therefore an ion beam of a given masscharge is brought to a focus when. Addition of an electric sector in a specified configuration provides a doublefocusing mass spectrometer, which can achieve higher mass resolution than can a single. Offers worldwide full compliance with any official dioxin, pcb, or pbde method e. Doublefocusing mass spectrometer instrument britannica.
Mass spectrometry mass spectrometer is similar to a prism. Test of a miniature doublefocusing mass spectrometer for. A new generation multiple collector plasma source mass spectrometer psms produced by nu instruments ltd is evaluated. Dec 22, 2010 mass spectrometry mass spectrometer is similar to a prism. The direction of deflection of the ion beam is the same in both sectors. Each volatizable sample is sequentially volatilized and analyzed in a double focusing mass spectrometer, whose output is in the form of separate ion beams all of which are simultaneously focused in a focal. A doublefocusing magnetic mass spectrometer for satellite use by carl a. The ion optical system was designed to satisfy the doublefocusing along a straight line being at a. Double focussing mass spectrograph jordan and bainbridge. The focusing nature for the instruments of direct combination has been discussed. Singlefocusing mass spectrometer definition of single. Double focusing magnetic sector mass analyzers are the classical model against which other mass analyzers are compared. Mattauch and herzog in 1934 and recently revised into a new type of mass filter. The instrument has a doublefocusing nierjohnson analyser with.
A new ion optical system of the miniature doublefocusing mass spectrograph was designed by trio 2. Vanhaecke, laser ablationinductively coupled plasmamass spectrometry using a doublefocusing sector field mass spectrometer of mattauchherzog geometry and an array detector for the determination of platinum group metals and gold in nis buttons obtained by fire assay of platiniferous ores, journal of. The method involves detection of fragment or daughter ions which arise from spontaneous or collisionally activated decomposition of parent ions in a field free region of the spectrometer. Both magnetic sector and quadrupole mass spectrometers can be jumped from one. Best quantitative performance of all mass spectrometer analyzers. Highresolution mass spectrometry hrms and fab spectra were obtained either on a vg instrument zab double focusing mass spectrometer boron a lct premier spectrometer micromass uk ltd operating in the esi mode meoh. Arrangement of the electrostatic and magnetic sectors in the mattauch herzog doublefocusing mass spectrometer. To improve the operating characteristics of an ma2 doublefocusing laser mass spectrometer or similar ones, a complex for electric recording of ion currents is developed, which allows one to conduct an elemental analysis in the online mode. The jeol double focusing jms mstation spectrometer has an upper mass of 2,400 th and a resolution of 60,000.
The spectromaxx enables the accurate analysis of copper and its alloys. The main advantages are the additional information provided in the form of generic relationships between ions in the mass spectrum and the high specificity. High resolution mass spectra were obtained on a vg 70250s double focusing mass spectrometer at 70 ev or on an abisciex qstar mass spectrometer with esisource, msms and accurate mass capabilities. Mass spectrometry is one of the most important tools, in order to get information about the. A double focusing mass spectrometer for geochronology article pdf available in international journal of mass spectrometry 1781. Since the ion paths through the magnetic sector are reversible, two ions of the same mass but different kinetic energies will be recombined at the detector slit. Dfms provides a higher resolution and more accurate mass measurements of ions. In particular, the interface employs two consecutive ion guides operated to dissociate adduct ions formed in the ion source or high pressure regions of the interface between the ion source and the mass analyzer, thus improving the limit of detection or limit. In the prism, light is separated into its component wavelengths which are then detected with an optical receptor, such as visualization. A double focusing mass spectrometer is used as the second mass analyzer of a mass spectrometrymass spectrometry instrument comprising a uniform electric field and a magnetic. A mass spectrometer in which a single magnetic sector is used to generate a magnetic field that differentiates ions based on their mz valuesi. The sensitive high resolution ion micro probe shrimp ii mass spectrometer is ideally suited for insitu analysis of uranium andor thoriumbearing minerals. A miniature mass spectrometer mms is a type of mass spectrometer ms which has small size and weight and can be understood as a portable or handheld device. Mass analyzer is the heart of the mass spectrometer that takes.
Traditionally, electric and magnetic sectors are placed in tandem to create a doublefocusing mass spectrometer 1618. This is particularly true for the double focusing mass spectrometer dfms, part of the rosina instrument. The secondorder focusing is very important to obtain both high resolution and high sensitivity at the same time 4. Arrangement of the electrostatic and magnetic sectors in the nier doublefocusing mass spectrometer. Laser ablationinductively coupled plasmamass spectrometry. Separation of masses in a mass spectrometer jeol produces doublefocusing. The mstation is a fullyautomated, highperformance, doublefocusing magnetic sector mass spectrometer designed for highresolution gcms analyses. A mass spectrometer which has magnetic and electric analysers combined in a specified geometrical configuration in order to accomplish both direction and velocity. Double focusing in general is achieved when ions emerging from an ion source with spreads in both energy and direction are ef.
The invention relates to a double focusing mass spectrometer with a combination of an electric and of a magnetic field for directional and velocity focusing. Miniature doublefocusing mass spectrometer design the design of the miniature mass analyzer is based on the mass separation and focusing capabilities of a 90 cylindrical doublefocusing mass analyzer using crossed electric and magnetic. In a quadrupole mass spectrometer, an ion current is injected. The contents of the solvent spray, the gas flow rate, the amount of applied voltage, the spray angle and the ion uptake angle, as well as the various distances in aligning the spray, sample. Mass analyzer is the heart of the mass spectrometer that takes ionized masses and separates them based on charge to mass ratios.
Spectro ms is a doublefocusing sector field icpms inductively coupled plasma mass spectrometer, which measures mass range for inorganic mass spectrometry. Pdf the performance characteristics of a double focusing mass spectrometer designed specifically for geochronology are described. The basic principles of mass separation in isotope measurements are. In malditof mass spectrometry, the ion source is matrixassisted laser desorptionionization maldi, and the mass analyzer is timeofflight tof analyzer. Aug 28, 1990 a double focusing mass spectrometer is used as the second mass analyzer of a mass spectrometrymass spectrometry instrument comprising a uniform electric field and a magnetic sector. A hewlettpackard 5710a gas chromatograph interfaced to a vg micromass 7070f double focusing mass spectrometer was used.
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