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 the reaction of nitrogen atoms with acetaldehyde

1968 ◽  
Vol 302 (1469) ◽  
pp. 167-183 ◽  
Keyword(s):  
Reaction Mechanism ◽  
Mass Spectrometer ◽  
Rate Constant ◽  
Electric Discharge ◽  
Flow System ◽  
Hydrogen Abstraction ◽  
Mass Spectrometric Study ◽  
Mass Spectrometric ◽  
Spectrometric Study ◽  
System A

The reaction of nitrogen atoms, produced by an electric discharge, with acetaldehyde has been studied in a flow system, a mass spectrometer being used to follow the course of the reaction. Sampling was carried out through a small hole in a gold diaphragm. The main stable products were HCN, H 2 and CO; a small amount of glyoxal was also formed. In addition appreciable amounts of a substance yielding ions of m/e = 43 were obtained. Arguments are presented for identifying this with the radical CH 2 CHO. Small amounts of a product giving ions of m/e = 86 were also produced. The nature of this material is discussed. No evidence was obtained for any hydrogen abstraction by nitrogen atoms. Experiments were also carried out with CH 3 CDO to clarify certain aspects of the proposed reaction mechanism . A few experimental results obtained with propionaldehyde can be understood in similar terms. The rate constant of the reaction N + CH 3 CHO → HCN + H 2 + HCO was deduced to be 1.20 ± 0.15 x 10 10 mole -1 cm 3 s -1 at 296°K.

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.

Sign in / Sign up

Export Citation Format

Share Document