scholarly journals Cold Electron Ionization (EI) Is Not a Supplementary Ion Source to Standard EI. It is a Highly Superior Replacement Ion Source

2021 ◽  
Author(s):  
Aviv Amirav ◽  
Alexander B. Fialkov ◽  
Alexander Gordin ◽  
Oneg Elkabets ◽  
Ksenia J. Margolin Eren
Keyword(s):  
Ion Source ◽  
Electron Ionization ◽  
Cold Electron

Reduction Reactions in the Ion Source in Electron Ionization Mass Spectrometry

2020 ◽  
Vol 75 (13) ◽  
pp. 1685-1692
Author(s):  
D. M. Mazur ◽  
M. E. Zimens ◽  
Th. B. Latkin ◽  
N. V. Ul’yanovskii ◽  
V. B. Artaev ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Ion Source ◽  
Electron Ionization ◽  
Electron Ionization Mass Spectrometry ◽  
Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Reduction Reactions

Low-energy, high-current, ion source with cold electron emitter

2012 ◽  
Vol 83 (2) ◽  
pp. 02B301
Author(s):  
A. V. Vizir ◽  
M. V. Shandrikov ◽  
G. Yu. Yushkov ◽  
E. M. Oks
Keyword(s):  
Ion Source ◽  
Low Energy ◽  
Cold Electron ◽  
High Current ◽  
Electron Emitter

Unimolecular Gas-Phase Reactions of Diethyl Phthalate, Isophthalate, and Terephthalate upon Electron Ionization

2003 ◽  
Vol 56 (5) ◽  
pp. 473 ◽  
Author(s):  
Susumu Tajima ◽  
Masashi Mamada ◽  
Satoshi Nakajima ◽  
Yutaka Takahashi ◽  
Nico M. M. Nibbering
Keyword(s):  
Gas Phase ◽  
Molecular Ions ◽  
Ion Source ◽  
Electron Ionization ◽  
Diethyl Phthalate ◽  
Gas Phase Reactions ◽  
Fragment Ions ◽  
Metastable Fragmentation ◽  
Primary Fragmentation ◽  
Ion Kinetic Energy

Unimolecular gas-phase reactions of diethyl phthalate (1), isophthalate (2), and terephthalate (3), upon electron ionization, have been investigated by use of mass-analyzed ion kinetic energy (MIKE) spectrometry and deuterium labelling. The metastable molecular ions (1)+ decompose to give exclusively the ions m/z 176 ([M – CH3CH2OH]+) and not the ions by the loss of CH3CH2O as proposed earlier in the literature. The metastable molecular ions (2)+ and (3)+ fragment differently from (1)+ and lead not only to the formation of the major fragment ions m/z 194 ([M − CH2CH2]+) via a McLafferty rearrangement but also to minor fragment ions m/z 193 ([M – CH2CH3]+).Yet, molecular ions decomposing in the ion source all show as primary fragmentation channel the loss of CH3CH2O to give the ions at m/z 177, which further dissociate to give the ions at m/z 149 through the loss of C2H4 or CO, indicating the resulting ions are +COC6H4COOH and +C6H4COOCH2CH3. The +COC6H4COOH ions decompose into the m/z 121, 93, and 65 ions by the consecutive losses of three carbon monoxide molecules, respectively. Prior to the second CO loss, a migration of the OH group to the benzene ring occurs. During the metastable fragmentation of the +C6H4COOCH2CH3 ions no ethoxy migration occurs, in contrast to the methoxy migration taking place in the metastable decomposition of the lower homologue +C6H4COOCH3 ions.

The interaction between the supersonic molecular beam and electron beam for the optimization of an electron ionization ion source

2019 ◽  
Vol 90 (10) ◽  
pp. 103308
Author(s):  
D. Liu ◽  
G. F. Qu ◽  
Y. Z. Wang ◽  
M. L. Zhou ◽  
M. Li ◽  
...  
Keyword(s):  
Electron Beam ◽  
Molecular Beam ◽  
Ion Source ◽  
Electron Ionization ◽  
Supersonic Molecular Beam

Analysis of impurities in pharmaceuticals by LC-MS with cold electron ionization

2020 ◽  
Vol 55 (10) ◽  
pp. e4587
Author(s):  
Svetlana Tsizin ◽  
Alexander B. Fialkov ◽  
Aviv Amirav
Keyword(s):  
Electron Ionization ◽  
Cold Electron

Ion source with electron ionization for a portable mass spectrometer

2009 ◽  
Vol 54 (11) ◽  
pp. 1714-1720 ◽  
Author(s):  
V. T. Kogan ◽  
D. S. Lebedev ◽  
Yu. V. Chichagov ◽  
I. V. Viktorov ◽  
I. T. Amanbaev ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
Ion Source ◽  
Electron Ionization ◽  
Portable Mass Spectrometer
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