Mass spectrometric and theoretical investigations into the formation of argon molecular ions in plasma mass spectrometry

1996 ◽  
Vol 11 (9) ◽  
pp. 643 ◽  
Author(s):  
J. Sabine Becker ◽  
Gotthard Seifert ◽  
Anatoli I. Saprykin ◽  
Hans-Joachim Dietze
Keyword(s):  
Mass Spectrometry ◽  
Molecular Ions ◽  
Mass Spectrometric ◽  
Theoretical Investigations ◽  
Plasma Mass Spectrometry

Compounds of aziadamantane type: Mass spectrometric study

1989 ◽  
Vol 54 (3) ◽  
pp. 691-698 ◽  
Author(s):  
Sergei D. Isaev ◽  
Nataliya F. Karpenko ◽  
Aleksandr G. Yurchenko ◽  
Luděk Vodička ◽  
Valentin I. Kadentsev ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectrometric Study ◽  
Nitrogen Molecule ◽  
Molecular Ions ◽  
Mass Spectrometric ◽  
Spectrometric Study ◽  
Molecular Ion ◽  
Mechanism Of Decomposition ◽  
Derivatives Of ◽  
Type Mass

Azi and hydrazi derivatives of adamantane,adamantanone and diamantane were studied by mass spectrometry. The EI spectra of azi derivatives lack completely molecular ions; the presence of abundant dehydroadamantane or dehydrodiamantane ions corresponds to elimination of nitrogen molecule from the molecular ion. Comparison of the EI ionization with photolysis or pyrolysis allowed to deduce some analogies and to suggest the mechanism of decomposition of the molecular ion.

High-temperature mass spectrometry: Instrumental techniques, ionization cross-sections, pressure measurements, and thermodynamic data (IUPAC Technical Report)

2005 ◽  
Vol 77 (4) ◽  
pp. 683-737 ◽  
Author(s):  
Jean Drowart ◽  
Christian Chatillon ◽  
John Hastie ◽  
David Bonnell
Keyword(s):  
Mass Spectrometry ◽  
High Temperature ◽  
Cross Sections ◽  
Molecular Ions ◽  
Mass Spectrometric ◽  
Ionization Cross ◽  
High Temperature Mass Spectrometry ◽  
Technical Report ◽  
Ionization Cross Sections ◽  
Inorganic Molecules

An assessment of high-temperature mass spectrometry and of sources of inaccuracy is made. Experimental, calculated, and estimated cross-sections for ionization of atoms and inorganic molecules typically present in high-temperature vapors are summarized. Experimental cross-sections determined for some 56 atoms are generally close to theoretically calculated values, especially when excitation–autoionization is taken into account. Absolute or relative cross-sections for formation of parent ions were measured for ca. 100 molecules. These include homonuclear diatomic and polyatomic molecules, oxides, chalcogenides, halides, and hydroxides. Additivity of atomic cross-sections supplemented by empirical corrections provides fair estimates of molecular cross-sections. Causes of uncertainty are differences in interatomic distances and in shapes of potential energy curves (surfaces) of neutral molecules and of molecular ions and tendency toward dissociative ionization in certain types of molecules. Various mass spectrometric procedures are described that render the accuracy of measured thermodynamic properties of materials largely independent of ionization cross-sections. This accuracy is comparable with that of other techniques applicable under the conditions of interest, but often only the mass spectrometric procedure is appropriate at high temperatures.

Studies in Mass Spectrometry. II. Random Hydrogen Rearrangement in Aromatic Molecular Ions

1962 ◽  
Vol 15 (4) ◽  
pp. 771 ◽  
Author(s):  
CG Macdonald ◽  
JS Shannon
Keyword(s):  
Mass Spectrometry ◽  
Aromatic Compounds ◽  
Mass Spectra ◽  
Molecular Ions ◽  
Mass Spectrometric ◽  
Deuterium Exchange ◽  
Molecular Ion ◽  
Hydrogen Rearrangement ◽  
Aromatic Hydrogen

To provide data for investigations by, inter alia, mass-spectrometric methods into the deuterium exchange of the aromatic hydrogen of some coal fractions, a study was made which confirmed the occurrence of completely random hydrogen rearrangement prior to or during the elimination of C2H2 in the molecular ions of benzene-1,2,3-d3, benzene-l,3,5-d3, naphthalene-1,2,3,4-d4, naphthalene-1,4,5,8-d4, and phenanthrene-9,10-d2, and in the phenyl ions derived from o-bromobenzene-d, m-bromobenzene-d, and p-chlorobenzene-d, Similar but incomplete hydrogen rearrangement was found to occur in the molecular ion of carbazole-N-d prior to or during elimination of HCN. Such rearrangements, for which mechanistic considerations are presented, must be taken into account when the mass spectra of deuterium-substituted aromatic compounds are being interpreted.

Massenspektrometrische Untersuchungen an ungesättigten Kohlenwasserstoffen: Halogen-Wanderung bei Acetylenen und Olefinen / Mass Spectrometric Investigations on Unsaturated Hydrocarbons: Halogen Migration in the Molecular Ions of Acetylenes and Alkenes

1979 ◽  
Vol 34 (11) ◽  
pp. 1612-1614 ◽  
Author(s):  
Klaus K. Mayer ◽  
Ilona Matolović ◽  
Erich Fischer ◽  
Carl Djerassi
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
Electron Impact ◽  
Molecular Ions ◽  
Mass Spectrometric ◽  
Electron Impact Mass Spectrometry ◽  
Unsaturated Hydrocarbons ◽  
Electron Impact Mass ◽  
Impact Mass

The migratory aptitude of halogens and simple nucleophilic substituents X in the molecular ions of alkynes 1-11 and alkenes 12-17 was investigated by electron-impact mass spectrometry using low and high resolution, metastable analysis and 2H-labelling.

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