Doubly Charged Molecular Ions in GC–MS with Cold EI

2019 ◽  
Vol 31 (2) ◽  
pp. 347-354
Author(s):  
Ksenia J. Margolin Eren ◽  
Alexander B. Fialkov ◽  
Uri Keshet ◽  
Svetlana Tsizin ◽  
Aviv Amirav
Keyword(s):  
Molecular Ions ◽  
Cold Ei ◽  
Doubly Charged

Stable Doubly Charged Positive Molecular Ions Formed by Direct Attachment of Alpha Particles to HCN and HNC

2004 ◽  
Vol 92 (13) ◽  
Author(s):  
Alicia Palacios ◽  
Fernando Martín ◽  
Otilia Mó ◽  
Manuel Yáñez ◽  
Zvonimir B. Maksić
Keyword(s):  
Molecular Ions ◽  
Alpha Particles ◽  
Doubly Charged ◽  
Direct Attachment

scholarly journals Взаимодействие alpha-частиц keV-энергий с молекулами глицил-лейцина

2021 ◽  
Vol 47 (12) ◽  
pp. 23
Author(s):  
А.А. Басалаев ◽  
А.Г. Бузыкин ◽  
В.В. Кузьмичев ◽  
М.Н. Панов ◽  
А.В. Петров ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Cross Sections ◽  
Density Functional ◽  
Molecular Ions ◽  
Functional Theory ◽  
The Density Functional Theory ◽  
Singly Charged ◽  
Doubly Charged ◽  
First Time ◽  
Fragmentation Processes

Radiation damage to isolated glycyl-leucine (C8H16N2O3) molecules caused by interaction with He2+ ions was studied. For the first time, the relative cross sections of the main processes of changes in the charge state of the collision partners and the relative cross sections of the fragmentation processes of singly and doubly charged molecular ions formed during single collisions of glycyl-leucine molecules with ions have been obtained. The optimized geometry of the molecule and singly charged glycyl-leucine ion was calculated using the density functional theory (DFT).

Electron impact studies. LXXVIII. Rearrangement ions and proximity effects in the 'doubly charged ion' mass spectra of benzoic acid derivatives

1973 ◽  
Vol 26 (1) ◽  
pp. 195 ◽  
Author(s):  
JH Bowie
Keyword(s):  
Benzoic Acid ◽  
Mass Spectra ◽  
General Feature ◽  
Molecular Ions ◽  
Ring System ◽  
Proximity Effects ◽  
Carboxyl Groups ◽  
Benzoic Acids ◽  
Benzoic Acid Derivatives ◽  
Doubly Charged

The technique of Beynon1,2 has been used to determine the ?doubly charged ion? mass spectra of a series of benzoic acid derivatives. A general feature of all spectra is the presence of pronounced M-CO species. The losses of carbon monoxide from the doubly charged molecular ions of m- amino- and m-hydroxy-benzoic acids originate mainly from the carboxyl groups, whereas the predominant loss from benzoic acid involves the aryl ring system. The spectra of anthranilates and salicylates contain peaks produced by characteristic proximity effects.

Studies of doubly charged molecular ions by means of ion photofragment spectroscopy

1992 ◽  
Author(s):  
Mats Larsson ◽  
Goran Sundstrom ◽  
Lars Brostrom ◽  
Sven Mannervik
Keyword(s):  
Molecular Ions ◽  
Doubly Charged

Doubly Charged Diatomic Molecular Ions

1955 ◽  
Vol 68 (12) ◽  
pp. 1199-1202 ◽  
Author(s):  
D R Bates ◽  
T R Carson
Keyword(s):  
Molecular Ions ◽  
Doubly Charged

Mass spectral studies of some desaurins and related 3,5-bismethylene-1,2,4-trithiolanes

1968 ◽  
Vol 46 (3) ◽  
pp. 365-375 ◽  
Author(s):  
Peter Yates ◽  
Thomas R. Lynch ◽  
L. S. Weiler
Keyword(s):  
Carbonyl Group ◽  
Mass Spectra ◽  
Molecular Ions ◽  
Spectral Studies ◽  
Mass Measurements ◽  
Metastable Peak ◽  
Fragmentation Pathways ◽  
Mass Spectral ◽  
Accurate Mass Measurements ◽  
Doubly Charged

The mass spectra of three desaurins and four related 3,5-bismethylene-1,2,4-trithiolanes have been interpreted with the aid of metastable peak assignments and accurate mass measurements. Strong molecular ion peaks are observed in the case of the aryl desaurins but not in that of their trithiolane counterparts. A variety of fragmentation pathways are postulated for the molecular ions, including cleavage on either side of a carbonyl group and elimination of a molecule of acylthioketene. In the case of the desaurins the latter process results in the formation of acylthioketene molecular ions, which could be distinguished from the doubly charged desaurin molecular ions. In the case of two of the trithiolanes, it is proposed that the ions resulting from loss of acylthioketene from the molecular ions undergo a novel type of McLafferty rearrangement and loss of carbon suboxysulfide to give aryl mercaptan molecular ions.

Fragmentation reactions of the singly and doubly charged molecular ions of dimethylanilines

1990 ◽  
Vol 101 (2-3) ◽  
pp. 355-374 ◽  
Author(s):  
Jianyao Wang ◽  
Raymond E. March ◽  
Shirlee J.A. Curtis ◽  
Alex G. Harrison
Keyword(s):  
Molecular Ions ◽  
Fragmentation Reactions ◽  
Doubly Charged
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