THE MERCURY-SENSITIZED PRIMARY DECOMPOSITION OF DEUTERATED PROPANES: A MASS SPECTROMETRIC STUDY AT LOW PRESSURES: PART II

1963 ◽  
Vol 41 (2) ◽  
pp. 347-354 ◽  
Author(s):  
M. Avrahami ◽  
P. Kebarle
Keyword(s):  
Isotope Effect ◽  
Mass Spectrometric Study ◽  
Mass Spectrometric ◽  
Primary Decomposition ◽  
Spectrometric Study ◽  
Deuterium Substitution ◽  
Primary Reactions ◽  
Low Pressures

The primary decomposition of C3H8, CD3CH2CD3, CH3CD2CH3, and C3D8 was found equal to: 10, 8, 5.5, and 5%.The primary reactions were[Formula: see text]The ratio a/b was strongly affected by deuterium substitution. The numerical values of the ratio for the compounds in the order given above are: 1.2, 6.8, 0.2, 0.9. Elucidation of the underlying reasons for this surprisingly large isotope effect might throw new light on the excited mercury – paraffin interaction.

THE MERCURY-PHOTOSENSITIZED DECOMPOSITION OF PROPANE: A MASS SPECTROMETRIC STUDY AT LOW PRESSURES: PART I

1963 ◽  
Vol 41 (2) ◽  
pp. 335-346 ◽  
Author(s):  
P. Kebarle ◽  
M. Avrahami
Keyword(s):  
Mass Spectrometric Study ◽  
Mass Spectrometric ◽  
Main Reaction ◽  
Primary Decomposition ◽  
Spectrometric Study ◽  
Hydrogen Atoms ◽  
Theoretical Predictions ◽  
Secondary Reactions ◽  
Cracking Reaction ◽  
Low Pressures

It is found that the primary decomposition involves the cleavage of a C—H bond. Both primary and secondary hydrogen atoms are lost. The relative rates of the two processes could not be determined accurately but are estimated to be approximately 1:1. It is found that at least 70% of the secondary reactions involves the interaction of hydrogen atom with a propyl radical. The main reaction is the re-formation of propane. An important disproportionation of hydrogen atoms with propyl radicals leading to propylene is shown to occur. The atomic cracking reaction H + C3H7 → C3H8* → C2H5 + CH3 is also observed. Using mixtures of C3H8 and C3D8 the relative cracking rate of n-propyl- to isopropyl-derived propane is determined to be equal to 5. This result is compared with theoretical predictions.

MASS SPECTROMETRIC STUDY OF THE SPECIES CS, SO, AND CCl2 PRODUCED IN PRIMARY HETEROGENEOUS REACTIONS

1957 ◽  
Vol 35 (1) ◽  
pp. 91-100 ◽  
Author(s):  
L. P. Blanchard ◽  
P. Le Goff
Keyword(s):  
Flow System ◽  
Mass Spectrometric Study ◽  
Mass Spectrometric ◽  
Heterogeneous Reactions ◽  
Bond Dissociation Energies ◽  
Spectrometric Study ◽  
Pure Tungsten ◽  
Bond Dissociation ◽  
Dissociation Energies ◽  
Low Pressures

In a flow system and at very low pressures, the reactions of CS2, H2S, SO2, and CCl4, on pure and carburized tungsten ribbons, were studied at 1300–2000° K.In the decomposition of CS2, on pure tungsten, CS and S2 are found—in that of H2S, H2 and S2—in that of SO2, O2 and SO or S2, according to the temperature—CCl4 gives CCl2, Cl2, and Cl. H2, S2, and Cl2 molecules are probably formed by recombination on the walls of atoms produced on the ribbon. With carburized tungsten the formation of S2 and O2 is replaced by that of CS and CO. On the contrary, no decarburization occurs with chlorine.Ionization potentials of the different species are measured and the deduced bond dissociation energies are discussed.

Mass spectrometric study of homologues of rhoeadine and structure of dubirheine

1965 ◽  
Vol 30 (7) ◽  
pp. 2464-2467 ◽  
Author(s):  
J. Slavík ◽  
V. Hanuš ◽  
K. Vokáč ◽  
L. Dolejš
Keyword(s):  
Mass Spectrometric Study ◽  
Mass Spectrometric ◽  
Spectrometric Study

High‐temperature mass spectrometric study of vaporization and thermodynamics of the Cs 2 O‐B 2 O 3 system: Review and experimental investigation

2021 ◽  
Vol 35 (11) ◽  
Author(s):  
Valentina L. Stolyarova ◽  
Viktor A. Vorozhtcov ◽  
Sergey I. Lopatin ◽  
Sergey M. Shugurov ◽  
Elizaveta P. Simonenko ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
High Temperature ◽  
Mass Spectrometric Study ◽  
Mass Spectrometric ◽  
Spectrometric Study ◽  
System Review

Mass spectrometric study of ceramics in the Sm 2 O 3 ‐ZrO 2 ‐HfO 2 system at high temperatures

2021 ◽  
Author(s):  
Valentina L. Stolyarova ◽  
Viktor A. Vorozhtcov ◽  
Sergey I. Lopatin ◽  
Sergey M. Shugurov ◽  
Andrey L. Shilov ◽  
...  
Keyword(s):  
High Temperatures ◽  
Mass Spectrometric Study ◽  
Mass Spectrometric ◽  
Spectrometric Study
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