Angle-dependence of ion kinetic energy spectra obtained by using mass spectrometers II. Experimental considerations and preliminary results on non-fragmenting systems

1984 ◽  
Vol 392 (1802) ◽  
pp. 89-106 ◽  
Keyword(s):  
Kinetic Energy ◽  
Energy Analysis ◽  
Energy Spectra ◽  
Observation Angle ◽  
Initial Angle ◽  
Mass Spectrometers ◽  
Small Uncertainty ◽  
Ion Kinetic Energy ◽  
Double Focusing ◽  
Selection Of

Experimental problems associated with studies of the scattering of kilovolt projectile ions in mass spectrometers designed primarily for chemical analysis are discussed. The parameters that are important in satisfactorily controlling and defining the actual scattering angle in relation to the observation angle are considered in detail. Two different experimental configurations are considered; angular selection before, or after kinetic energy analysis of the collision products. A modification to a VG ZAB-2F double-focusing mass spectrometer, in order to observe angle-resolved ion kinetic energy spectra of collisionally scattered ion beams, is described. Initial angle-resolved experiments on systems that do not involve fragmentation, have been performed. The results are presented for the angle-resolved energy loss spectra of Ar + and N 2 + and the angle-resolved charge-stripping of Ar + . A feature of the apparatus described is the small uncertainty in the angular selection of the analysing angle-resolved slit.

The mass and ion kinetic energy spectra of H 2 , HD and D 2

1972 ◽  
Vol 327 (1568) ◽  
pp. 1-11 ◽  
Keyword(s):  
Fine Structure ◽  
Kinetic Energy ◽  
Energy Release ◽  
Isotope Effects ◽  
Kinetic Energy Release ◽  
Energy Spectra ◽  
Vibrational States ◽  
First Excited State ◽  
Ion Kinetic Energy ◽  
Double Focusing

The collision-induced reactions, (1) H +· 2 → H + + H · , (2) H + 3 → H + + H 2 , and (3) H + 3 → H +· 2 + H · , and the corresponding reactions of the deuterated species, have been examined for their kinetic energy release using a double focusing mass spectrometer. Reaction (1) encompasses two discrete processes, the first apparently involving only the ground electronic state of H + 2 and the second apparently occurring via excitation to the repulsive first excited state. Isotope effects on the kinetic energy release associated with the transition to the repulsive state in process (1) are consistent with the proposed mechanism. Process (2) gives a ‘meta- ­ stable peak’ which shows fine structure, possibly due to individual vibrational states of H 2 . Reaction (3) occurs by electronic transition to a repulsive state(s).

Rearrangements in the Molecular Ions of Some ortho-Substituted Schiff Bases

1993 ◽  
Vol 46 (6) ◽  
pp. 895 ◽  
Author(s):  
T Blumenthal ◽  
M Dosen ◽  
RG Gillis ◽  
QN Porter
Keyword(s):  
Kinetic Energy ◽  
Schiff Bases ◽  
Molecular Ions ◽  
Energy Spectra ◽  
Supporting Evidence ◽  
Deuterium Labelling ◽  
Methyl Group ◽  
Molecular Ion ◽  
Fragment Ions ◽  
Ion Kinetic Energy

Under electron ionization conditions, the ortho-substituted Schiff bases N-benzylidene-o-toluidine (1a), N-(o-methylbenzylidene)aniline (1b), N-salicylideneaniline (1c) and N-(o-methoxybenzylidene)aniline (1d) give fragment ions which have been shown by collision-activated mass-analysed ion kinetic energy spectra to have the structure of the protonated molecular ions of indole (2), benzofuran (3), and 1,2-benzisoxazole (4). The molecular ion of N-(o-methylbenzylidene)-o-toluidine (1f) gives as fragment ions not only the protonated molecular ion (2) of indole and the tropylium ion but also the molecular ion of anthracene. Attempts to find supporting evidence for a mechanism for this rearrangement by deuterium labelling of a methyl group in (1b), such as (1g), have been unsuccessful.

The Electron Impact Induced Fragmentation of 1-Aryl-5-hydroxy-1,2,3-triazole-4-carboxamides

1990 ◽  
Vol 43 (12) ◽  
pp. 2021 ◽  
Author(s):  
AT Lebedev ◽  
TY Samguina ◽  
T Blumenthal ◽  
MY Kolobov
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
Kinetic Energy ◽  
Electron Impact ◽  
High Resolution Mass Spectrometry ◽  
Energy Spectra ◽  
Molecular Ion ◽  
High Resolution Mass ◽  
Ion Kinetic Energy ◽  
Resolution Mass

The pathways of the electron impact induced fragmentation of 1-aryl-5- hydroxy-1,2,3-triazole-4-carboxamides were studied. The compositions of the key ions were confirmed by high-resolution mass spectrometry. The proposed pathways were established from mass analysed ion kinetic energy spectra, and B/E and B2/E linked scans. A variety of structures for the molecular ion of the title compounds is proposed.

Mass and ion kinetic energy spectra of some chlorinated dibenzo-p-dioxins

1975 ◽  
Vol 47 (2) ◽  
pp. 327-329 ◽  
Author(s):  
S. Safe ◽  
W. D. Jamieson ◽  
O. Hutzinger ◽  
A. E. Pohland
Keyword(s):  
Kinetic Energy ◽  
Energy Spectra ◽  
Ion Kinetic Energy
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