The electron impact, chemical ionization and fast atom bombardment positive ion mass spectra of 1,2-bis(sulfonyl)methylhydrazines

1991 ◽  
Vol 20 (11) ◽  
pp. 693-698 ◽  
Author(s):  
Giuseppe Giordano ◽  
Glenn Peterson ◽  
Walter J. McMurray ◽  
Shyam Krishnamurthy ◽  
Alan C. Sartorelli
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Fast Atom Bombardment ◽  
Positive Ion

A comparison of the electron impact and fast atom bombardment mass spectra of some group IV organometallic halides

1985 ◽  
Vol 63 (8) ◽  
pp. 2308-2312 ◽  
Author(s):  
Jack M. Miller ◽  
Adrian Fulcher
Keyword(s):  
Electron Impact ◽  
Condensed Phase ◽  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Group Iv ◽  
Major Exception ◽  
Positive Ion ◽  
Fab Mass Spectra ◽  
Primary Ionization

The positive ion fast atom bombardment (FAB) mass spectra of a series of group IV organometallic halides, (phenyl)3MCl (M = Ge, Sn, Pb), (phenyl)3PbX (X = Cl, Br, I) and Sn(phenyl)nCl4−n are reported in a sulfolane matrix, and compared to their corresponding EI spectra. The use of other matrix liquids such as glycerol thioglycerol, diamylphenol, 18-crown-6/tetraglyme, and p-nitrophenyloctylether are discussed. Disappointingly FAB, like EI, does not produce significant parent ions for group IV organometallics. The FAB and EI spectra are remarkably similar with one major exception. In EI, the loss of a phenyl is preferred over the loss of a halide, while in FAB the reverse is the case, strongly suggesting that the primary ionization occurs in the condensed phase.

Chemical Ionization Mass Spectrometry of Organophosphorus Insecticides

1974 ◽  
Vol 57 (5) ◽  
pp. 1050-1055 ◽  
Author(s):  
Roy L Holmstead ◽  
John E Casida
Keyword(s):  
Mass Spectrometry ◽  
Electron Impact ◽  
Mass Spectra ◽  
Chemical Structure ◽  
Chemical Ionization ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Organophosphorus Insecticides ◽  
Fragmentation Patterns

Abstract The chemical ionization (CI) mass spectra of 15 important organophosphorus insecticides and 14 of their major metabolites are discussed in relation to the effect of chemical structure on fragmentation patterns. The fragments obtained with CI are sometimes quite different from those formed on electron impact and, in general, simpler spectra are obtained with CI.

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