"MIKES" redirects here. For other uses, see Mikes.
Mass-analyzed ion kinetic-energy spectrometry (MIKES) is a mass spectrometry technique by which mass spectra are obtained from a sector instrument that incorporates at least one magnetic sector plus one electric sector in reverse geometry (the beam first enters the magnetic sector).[1][2][3] The accelerating voltageV, and the magnetic fieldB, are set to select the precursor ions of a particular m/z. The precursor ions then dissociate or react in an electric field-free region between the two sectors. The ratio of the kinetic energy to charge of the product ions are analyzed by scanning the electric sector field E. The width of the product ion spectrum peaks is related to the kinetic energy release distribution for the dissociation process.[4]
MIKES was developed at Purdue University in 1973 by Beynon, Cooks, J. W. Amy, W. E. Baitinger, and T. Y. Ridley.[5] MIKES was invented because researches at Purdue and Cornell thought that if the parent ion was mass-selected before the dissociation and mass analysis of the products by the electric sector it would be easier to study the metastable ions and the collision-induced dissociation (CID).[6] This was an achievement because it combined the utility of previous instruments such as the ion kinetic energy spectrometer with the ability to mass select precursor ions. That precursor ion is mass selected with the magnetic sector. The dissociation products are then mass analyzed using the electric sector. "The peak shapes revealed from the electric sector scan can provide information on the kinetic energy release from in the course of fragmentation and on the kinetic energy uptake in the course of ionic collision processes."[citation needed] The dispersion of velocities due to kinetic energy release leads to the characteristic wide metastable peaks observed using MIKES techniques.[5]
Applicationedit
Schematic diagram of MIKES
MIKES is a powerful technique used for structural studies of organic compounds, gaseous ions, and also for direct analysis of complex mixtures without separation of the components.[3][7] In other words, it is used for molecular structure studies.[8] The reason why MIKES is good for molecular structure studies is due to the reverse-geometry of MIKES. The MIKES Schematic shows that the ion species in the source goes into the magnetic field. After which, the chemistry is later studied in the second field-free region (FFR) by scanning the electric sector which defines the nature of the fragments by measuring their kinetic energy. This causes competitive unimolecular fragmentations that can be observed in the MIKE spectra. Furthermore, if gas is brought into the second FFR, more dissociation will be induced by collision, that will later appear in the MIKE spectra.[3]
Tandem MS scanedit
This scan uses reverse-geometry (BE-type) instruments. These instruments use a front-end magnetic sector that allows for exclusive mass selection of the precursor ion. The fragmentation region is in-between the two analyzers. The electric sector scan gives the product-ion spectrum. MIKES can also be used for direct measurement of kinetic-energy release values.[9]
Advantagesedit
MIKES, as the name implies, is used for kinetic energy spectrometery. This means that certain criteria are needed to accomplish this. One such feature of MIKES is that it has high kinetic energy resolution and good angular resolution.[7] This is due to the fact that MIKES has low accelerating voltage, around 3 kilo-volts.[3] Another feature is that it has good differential pumping between the various regions of the instrument. In addition, MIKES has multiple systems for bringing in and/or overseeing collision gases or vapors and the ability to vary slit height and width. This prevents favoritism when determining kinetic energy distributions. Although common now, back in the 1970s, MIKES had a great computer compatibility that allowed for readily obtainable molecular structures.[7]
Disadvantagesedit
A disadvantage to MIKES is that observations are made later in the ion flight path when compared to other methods. Also, a smaller number of ions will typically decompose. This will in turn cause the sensitivity to be lower than other kinetic energy spectroscopy methods.[10]
^Soltero-Rigau E, Kruger TL, Cooks RG (1977). "Identification of barbiturates by chemical ionization and mass-analyzed ion kinetic energy spectrometry". Anal. Chem. 49 (3): 435–42. doi:10.1021/ac50011a027. PMID 842853.
^Easton C, Johnson DW, Poulos A (1988). "Determination of phospholipid base structure by CA MIKES mass spectrometry". J. Lipid Res. 29 (1): 109–12. doi:10.1016/S0022-2275(20)38562-X. PMID 3356947.
^ abcdCooks RG, Kondrat RW, Youssefi M, McLaughlin JL (1981). "Mass-analyzed ion kinetic energy (MIKE) spectrometry and the direct analysis of coca". J Ethnopharmacol. 3 (2–3): 299–312. doi:10.1016/0378-8741(81)90060-X. PMID 7242113.
^Yeh, Chul; Myung Soo Kim (1992). "Analysis of a mass-analyzed ion kinetic energy profile. II. Systematic determination of the kinetic energy release distribution" (PDF). Rapid Communications in Mass Spectrometry. 6 (4): 293–297. Bibcode:1992RCMS....6..293Y. doi:10.1002/rcm.1290060414. Retrieved 2008-03-30.[dead link]
^Amy, J. W.; Baitinger, W. E.; Cooks, R. G. (1990). "Building mass spectrometers and a philosophy of research". Journal of the American Society for Mass Spectrometry. 1 (2): 119–128. doi:10.1016/1044-0305(90)85047-P. ISSN 1044-0305. PMID 24248739.
^ abcBeynon, J. H.; Cooks, R. G.; Amy, J. W.; Baitinger, W. E.; Ridley, T. Y. (2012). "Design and Performance of a Mass-analyzed Ion Kinetic Energy (MIKE) Spectrometer". Analytical Chemistry. 45 (12): 1023A–1031A. doi:10.1021/ac60334a763. ISSN 0003-2700.
^Beynon, J H; Cooks, R G (1974). "Ion kinetic energy spectrometry". Journal of Physics E: Scientific Instruments. 7 (1): 10–18. Bibcode:1974JPhE....7...10B. doi:10.1088/0022-3735/7/1/002. ISSN 0022-3735.
^Dass, Chhabil. Fundamentals of Contemporary Mass Spectrometry. Hoboken, NJ: Wiley-Interscience, 2007. Print.
^Dominic Desiderio (2000). Analysis of Neuropeptides by Liquid Chromatography and Mass Spectrometry. Elsevier Science. ISBN9780080875545.
Further readingedit
Jacques Momigny; Eugen Illenberger (1999). Gaseous Molecular Ions: An Introduction To Elementary Processes Induced By Ionization (Topics in Physical Chemistry). Darmstadt: Steinkopff. ISBN3-7985-0870-4.
December 15, 2023
mass, analyzed, kinetic, energy, spectrometry, mikes, redirects, here, other, uses, mikes, mass, analyzed, kinetic, energy, spectrometry, mikes, mass, spectrometry, technique, which, mass, spectra, obtained, from, sector, instrument, that, incorporates, least,. MIKES redirects here For other uses see Mikes Mass analyzed ion kinetic energy spectrometry MIKES is a mass spectrometry technique by which mass spectra are obtained from a sector instrument that incorporates at least one magnetic sector plus one electric sector in reverse geometry the beam first enters the magnetic sector 1 2 3 The accelerating voltage V and the magnetic field B are set to select the precursor ions of a particular m z The precursor ions then dissociate or react in an electric field free region between the two sectors The ratio of the kinetic energy to charge of the product ions are analyzed by scanning the electric sector field E The width of the product ion spectrum peaks is related to the kinetic energy release distribution for the dissociation process 4 MIKES instrument Contents 1 History 2 Application 3 Tandem MS scan 4 Advantages 5 Disadvantages 6 See also 7 References 8 Further readingHistory editMIKES was developed at Purdue University in 1973 by Beynon Cooks J W Amy W E Baitinger and T Y Ridley 5 MIKES was invented because researches at Purdue and Cornell thought that if the parent ion was mass selected before the dissociation and mass analysis of the products by the electric sector it would be easier to study the metastable ions and the collision induced dissociation CID 6 This was an achievement because it combined the utility of previous instruments such as the ion kinetic energy spectrometer with the ability to mass select precursor ions That precursor ion is mass selected with the magnetic sector The dissociation products are then mass analyzed using the electric sector The peak shapes revealed from the electric sector scan can provide information on the kinetic energy release from in the course of fragmentation and on the kinetic energy uptake in the course of ionic collision processes citation needed The dispersion of velocities due to kinetic energy release leads to the characteristic wide metastable peaks observed using MIKES techniques 5 Application edit nbsp Schematic diagram of MIKESMIKES is a powerful technique used for structural studies of organic compounds gaseous ions and also for direct analysis of complex mixtures without separation of the components 3 7 In other words it is used for molecular structure studies 8 The reason why MIKES is good for molecular structure studies is due to the reverse geometry of MIKES The MIKES Schematic shows that the ion species in the source goes into the magnetic field After which the chemistry is later studied in the second field free region FFR by scanning the electric sector which defines the nature of the fragments by measuring their kinetic energy This causes competitive unimolecular fragmentations that can be observed in the MIKE spectra Furthermore if gas is brought into the second FFR more dissociation will be induced by collision that will later appear in the MIKE spectra 3 Tandem MS scan editThis scan uses reverse geometry BE type instruments These instruments use a front end magnetic sector that allows for exclusive mass selection of the precursor ion The fragmentation region is in between the two analyzers The electric sector scan gives the product ion spectrum MIKES can also be used for direct measurement of kinetic energy release values 9 Advantages editMIKES as the name implies is used for kinetic energy spectrometery This means that certain criteria are needed to accomplish this One such feature of MIKES is that it has high kinetic energy resolution and good angular resolution 7 This is due to the fact that MIKES has low accelerating voltage around 3 kilo volts 3 Another feature is that it has good differential pumping between the various regions of the instrument In addition MIKES has multiple systems for bringing in and or overseeing collision gases or vapors and the ability to vary slit height and width This prevents favoritism when determining kinetic energy distributions Although common now back in the 1970s MIKES had a great computer compatibility that allowed for readily obtainable molecular structures 7 Disadvantages editA disadvantage to MIKES is that observations are made later in the ion flight path when compared to other methods Also a smaller number of ions will typically decompose This will in turn cause the sensitivity to be lower than other kinetic energy spectroscopy methods 10 See also editGas phase ion chemistry Unimolecular ion decomposition R Graham CooksReferences edit Soltero Rigau E Kruger TL Cooks RG 1977 Identification of barbiturates by chemical ionization and mass analyzed ion kinetic energy spectrometry Anal Chem 49 3 435 42 doi 10 1021 ac50011a027 PMID 842853 Easton C Johnson DW Poulos A 1988 Determination of phospholipid base structure by CA MIKES mass spectrometry J Lipid Res 29 1 109 12 doi 10 1016 S0022 2275 20 38562 X PMID 3356947 a b c d Cooks RG Kondrat RW Youssefi M McLaughlin JL 1981 Mass analyzed ion kinetic energy MIKE spectrometry and the direct analysis of coca J Ethnopharmacol 3 2 3 299 312 doi 10 1016 0378 8741 81 90060 X PMID 7242113 Yeh Chul Myung Soo Kim 1992 Analysis of a mass analyzed ion kinetic energy profile II Systematic determination of the kinetic energy release distribution PDF Rapid Communications in Mass Spectrometry 6 4 293 297 Bibcode 1992RCMS 6 293Y doi 10 1002 rcm 1290060414 Retrieved 2008 03 30 dead link a b MIKES History and Significance ASMS Web lt http www asms org docs history posters mikes pdf gt Amy J W Baitinger W E Cooks R G 1990 Building mass spectrometers and a philosophy of research Journal of the American Society for Mass Spectrometry 1 2 119 128 doi 10 1016 1044 0305 90 85047 P ISSN 1044 0305 PMID 24248739 a b c Beynon J H Cooks R G Amy J W Baitinger W E Ridley T Y 2012 Design and Performance of a Mass analyzed Ion Kinetic Energy MIKE Spectrometer Analytical Chemistry 45 12 1023A 1031A doi 10 1021 ac60334a763 ISSN 0003 2700 Beynon J H Cooks R G 1974 Ion kinetic energy spectrometry Journal of Physics E Scientific Instruments 7 1 10 18 Bibcode 1974JPhE 7 10B doi 10 1088 0022 3735 7 1 002 ISSN 0022 3735 Dass Chhabil Fundamentals of Contemporary Mass Spectrometry Hoboken NJ Wiley Interscience 2007 Print Dominic Desiderio 2000 Analysis of Neuropeptides by Liquid Chromatography and Mass Spectrometry Elsevier Science ISBN 9780080875545 Further reading editJacques Momigny Eugen Illenberger 1999 Gaseous Molecular Ions An Introduction To Elementary Processes Induced By Ionization Topics in Physical Chemistry Darmstadt Steinkopff ISBN 3 7985 0870 4 Retrieved from https en wikipedia org w index php title Mass analyzed ion kinetic energy spectrometry amp oldid 1170034693, wikipedia, wiki, book, books, library,
