The effects of heating rate and sample size on the direct exposure/chemical ionization mass spectra of some biological conjugates

1979 ◽  
Vol 6 (7) ◽  
pp. 287-293 ◽  
Author(s):  
Robert J. Cotter ◽  
Catherine Fenselau
Keyword(s):  
Sample Size ◽  
Heating Rate ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Ionization Mass ◽  
Direct Exposure

scholarly journals Discrimination of structural isomers of amphetamine using carbon dioxide negative-ion chemical ionization mass spectrometry

1997 ◽  
Vol 13 (2) ◽  
pp. 151-161 ◽  
Author(s):  
Kevin B. Thurbide ◽  
C. M. Elson ◽  
P. G. Sim
Keyword(s):  
Carbon Dioxide ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Negative Ion ◽  
Ionization Mass ◽  
Structural Isomers ◽  
Mass Spectral ◽  
Negative Ion Chemical Ionization ◽  
Spectral Behaviour ◽  
Carbon Dioxide Plasma

The negative‒ion chemical ionization mass spectra of a group of structural isomers of amphetamine have been studied using carbon dioxide as the reagent gas. Characteristic and reproducible differences are observed for each member of the set implying that this technique offers a means of distinguishing among groups of amphetamine isomers. Characteristic adducts to the molecular ion are observed in the form (M–[H]+[O]) and (M–[H]+[CO2]). Descriptions of some fragments are given based on the mass spectral behaviour of a set of analogue compounds and the results of oxygen-18 labelled carbon dioxide reagent gas experiments. Contents of the carbon dioxide plasma and their impact on various analytes is also discussed.

The monomeric metaphosphate anion in negative-ion chemical-ionization mass spectra of phosphotriesters

1984 ◽  
Vol 106 (23) ◽  
pp. 6877-6883 ◽  
Author(s):  
Seymour Meyerson ◽  
Donald J. Harvan ◽  
J. Ronald Hass ◽  
Fausto Ramirez ◽  
James F. Marecek
Keyword(s):  
Mass Spectra ◽  
Chemical Ionization ◽  
Negative Ion ◽  
Ionization Mass ◽  
Negative Ion Chemical Ionization

Negative chemical ionization mass spectra of polycyclic chlorinated insecticides

1972 ◽  
Vol 6 (11) ◽  
pp. 1171-1181 ◽  
Author(s):  
Ralph C. Dougherty ◽  
John Dalton ◽  
Francis J. Biros
Keyword(s):  
Mass Spectra ◽  
Chemical Ionization ◽  
Ionization Mass ◽  
Negative Chemical Ionization

Isobutane chemical ionization mass spectra of lanthanide perfluorinated .beta.-diketonates

1974 ◽  
Vol 46 (6) ◽  
pp. 726-728 ◽  
Author(s):  
T. H. Risby ◽  
P. C. Jurs ◽  
F. W. Lampe ◽  
A. I. Yergey
Keyword(s):  
Mass Spectra ◽  
Chemical Ionization ◽  
Ionization Mass

Chemical ionization mass spectra of mononitroarenes

1980 ◽  
Vol 15 (6) ◽  
pp. 284-288 ◽  
Author(s):  
Alex. G. Harrison ◽  
R. Krishna Mohan Rao Kallury
Keyword(s):  
Mass Spectra ◽  
Chemical Ionization ◽  
Ionization Mass
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