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

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

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

Evaluation of nitric oxide chemical ionization mass spectra of substituted benzenes

1991 ◽  
Vol 26 (5) ◽  
pp. 486-492 ◽  
Author(s):  
Shigeki Daishima ◽  
Yoshio Lida ◽  
Fujihiro Kanda
Keyword(s):  
Nitric Oxide ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Ionization Mass ◽  
Substituted Benzenes

ChemInform Abstract: STERIC STRUCTURE AND CHEMICAL IONIZATION MASS SPECTRA OF ISOMERIC OXIMES OF 2-SUBSTITUTED 3-QUINUCLIDONES

1984 ◽  
Vol 15 (13) ◽  
Author(s):  
O. S. ANISIMOVA ◽  
YU. N. SHEINKER ◽  
E. E. MIKHLINA ◽  
O. I. GORBYLEVA ◽  
L. N. YAKHONTOV
Keyword(s):  
Mass Spectra ◽  
Chemical Ionization ◽  
Steric Structure ◽  
Ionization Mass

Isobutane Chemical Ionization Mass Spectrographic Examination of Explosives

1975 ◽  
Vol 58 (4) ◽  
pp. 734-742 ◽  
Author(s):  
Richard Saferstein ◽  
Jew-Ming Chao ◽  
John J Manura
Keyword(s):  
Mass Spectrometer ◽  
Mass Spectra ◽  
Thermal Instability ◽  
Chemical Ionization ◽  
High Sensitivity ◽  
Gas Pressure ◽  
Ionization Mass ◽  
Pentaerythritol Tetranitrate ◽  
Residue Detection ◽  
Acetone Extracts

Abstract The detection of explosive residues in debris is difficult because of the thermal instability of many explosives along with the high sensitivity requirements of the analyses. The isobutane chemical ionization (CI) mass spectra of common civilian and military explosives were obtained under different instrumental parameters. The intent of the study was to determine the feasibility of applying CI to residue detection. The CI spectra of the explosives 1,3,5-trinitro-1,3,5-triazocydohexane, 1,3,5,7-tetraazocyclooctane, and pentaerythritol tetranitrate were shown to be particularly sensitive to the conditions of source temperature and reagent gas pressure. These parameters were adjusted to yield the least complex CI spectra for the explosives studied. The simplicity of the CI spectra obtained makes it a feasible technique for detecting explosive residues in the presence of extraneous materials found in the acetone extracts of debris material. Placement of the extract into the direct probe of the CI mass spectrometer eliminates the need for prior chromatographic treatment of the extract and would optimize the high sensitivity of the CI technique.

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