Fragmentation and kinetic energy release distribution of ions produced from methanol CH3OH

Szot, E.; Wójcik, Leszek; Głuch, K.

doi:10.1016/j.vacuum.2012.04.040

Cited by 6 publications

(5 citation statements)

References 17 publications

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“…Our methanol spectrum also compares quite well with data from Srivastava et al [34], Douglas and Price [42] and Cummings and Bleakney [43], although there are some differences noted for data at masses 1 amu, 15 amu, 29 amu and 32 amu reported by [42] and for masses 15 amu, 28 amu, 29 amu, 32 amu reported by [43]. The data obtained by Szot et al [45] compares well to our data in the mass region above 28 amu for methanol, while for ethanol better agreement was found for masses 15 amu, 26 amu, 27 amu, 30 amu, 32 amu, 42 amu and 45 amu. We found good agreement between our 1-propanol spectrum [3] and the relative ratio intensities from Maccoll [47], as can be seen in Fig.…”

Section: Resultssupporting

confidence: 89%

“…In our spectrum of 1-butanol [3] a large number of low intensity cations peaks were registered, which were not previously observed by Zavilopulo et al [41] and Friedel et al [47], very likely due the higher sensitivity of our apparatus. Nixon [1] NIST [63] Srivastava [34] Cummings [43] Szot [45] Douglas [42] Relative Abundances Cation Mass (amu)…”

Section: Resultsmentioning

confidence: 99%

“…These data were compared with experimental results reported in the literature, obtained by the application of different techniques, i.e. Srivastava et al [34] whose apparatus employed a QMS a mass filter, Rejoub et al [20] and Douglas et al [42] who used different versions of TOF mass filters, Hudson et al [36] who used a total ionization cell to measure the absolute TICS with no mass selectivity, Zavilopulo et al [41] whose apparatus employed a monopole mass selector, Cummings and Bleakney [43] who used a 180 o mass selector and Szot et al [45] who used a magnetic sector field followed by the electric sector field analyzer.…”

Section: Experimental and Theoretical Methodsmentioning

confidence: 99%

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Electron impact ionization and fragmentation of biofuels

et al. 2020

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Experimental and Theoretical Methodsmentioning

confidence: 99%

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Electron impact ionization and fragmentation of biofuels

et al. 2020

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“…The cation at mass 28 amu could then arise from the ionization of CO produced as a degradation product, rather than being an indication of contaminants. Likewise, the data of Szot et al [43] has a very large intensity at 18 amu, a relative abundance of 32, rather than ~ 1 for the other data presented in table 1.…”

Section: Mass Spectramentioning

confidence: 57%

Electron impact ionisation and fragmentation of methanol and ethanol

Nixon

Pires

Neves

et al. 2016

International Journal of Mass Spectrometry

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Electron impact ionisation and dissociative ionisation of the two smallest primary alcohols have been investigated. A quadrupole mass spectrometer was used, with an internal ionising electron source resulting in an energy resolution of ~ 0.8 eV. The partial ionisation cross sections (PICS) for a number of individual cations have been measured for energies between 10 - 100 eV. The present data compares well with previous results for methanol. Surprisingly, however, this study is the first to report individual PICS for ethanol. The sum of the present PICS for both methanol and ethanol is also compared to the total ionisation cross sections reported in the literature and are found to be in good accord. Additionally, appearance energies have been derived by fitting the Wannier equation to data measured within ~ 2 eV of the cation formation threshold. However, the low energy resolution limits the precision with which these values are able to be determined. This study also establishes the validity of the data collected using the apparatus at Universidade Federal de Juiz de Fora (UFJF) and so provides a solid foundation for further studies of larger alcohols

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“…Cummings and Bleakney [24] used a 180 • mass selector to report the appearance energies for a selection of the cations, generated by electron impact ionization of methanol. Szot et al [25] used double focusing mass spectrometer of reversed (B-E) geometry to investigate the ionization and fragmentation processes of methanol.…”

Section: Introductionmentioning

confidence: 99%

Electron impact partial ionization cross sections of methyl alcohol up to 5 keV using the mass spectrometry data

et al. 2021

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The electron impact partial ionization cross sections (PICSs) of methyl alcohol fragments are reported from ionization threshold to 5 keV. The calculations employ use of electron impact mass spectrometry data and a modified form of binary-encounter-Bethe (BEB) model. In the modified-BEB approach, the binding energy of each occupied molecular orbital is incremented by an amount such that the highest occupied molecular orbital reflects the appearance potential of a particular fragment. The PICSs are then obtained by appropriately scaling the cross section data using the branching ratios (BR). The BRs can either be obtained from the cross section data or using the mass spectrometry data at an energy at which the mass spectrum is recorded. The PICSs are summed to obtain the total ionization cross sections (TICS) of the methyl alcohol. The results are in good agreement with the experimental results and are superior to the existing theoretical results. A simple approach like this in conjunction with mass spectrometry would be of immense help in modeling and interpretation of ionization data. The study reveals the need for more consistent ion energetics and mass spectrometry data for an accurate modeling of PICSs.

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Fragmentation and kinetic energy release distribution of ions produced from methanol CH3OH

Cited by 6 publications

References 17 publications

Electron impact ionization and fragmentation of biofuels

Electron impact ionization and fragmentation of biofuels

Electron impact ionisation and fragmentation of methanol and ethanol

Electron impact partial ionization cross sections of methyl alcohol up to 5 keV using the mass spectrometry data

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