To the theory of radiation chemistry. I. Application of principles of the simplified quasi-equilibrium theory of mass spectra to the determination of radiation chemical yields of a gas phase radiolysis

1966 ◽  
Vol 31 (8) ◽  
pp. 3252-3262 ◽  
Author(s):  
Z. Prášil
Keyword(s):  
Gas Phase ◽  
Mass Spectra ◽  
Radiation Chemistry ◽  
Equilibrium Theory ◽  
Quasi Equilibrium ◽  
Radiation Chemical

Improved Rate Expression in the Quasi‐Equilibrium Theory of Mass Spectra

1962 ◽  
Vol 37 (6) ◽  
pp. 1276-1283 ◽  
Author(s):  
Marvin Vestal ◽  
Austin L. Wahrhaftig ◽  
William H. Johnston
Keyword(s):  
Mass Spectra ◽  
Equilibrium Theory ◽  
Quasi Equilibrium ◽  
Rate Expression

The isolation of 11-oxotetrahydrorhombifoline from Ormosia coutinhoi and a study of its mass spectrum

1967 ◽  
Vol 45 (7) ◽  
pp. 751-757 ◽  
Author(s):  
Stewart McLean ◽  
A. G. Harrison ◽  
D. G. Murray
Keyword(s):  
Mass Spectrum ◽  
Electron Impact ◽  
Mass Spectra ◽  
Equilibrium Theory ◽  
Side Chain ◽  
Fragmentation Reaction ◽  
Quasi Equilibrium ◽  
Molecular Ion ◽  
Dihydro Derivative ◽  
A Minor

11-Oxotetrahydrorhombifoline (I) has been isolated from the alkaloidal extract of the bark of Ormosia coutinhoi, and its dihydro derivative II has been prepared. An examination of the mass spectra of these compounds and of their 3,3-d2 derivatives has led to the elucidation of the course of the major electron impact induced fragmentations undergone by the molecules. The main fragmentation of I leads to loss of C3H5 from the side chain to form an ion of m/e 221, with a minor path involving a central fission of the molecular ion to form an ion of m/e 150. The mass spectrum of II shows that the loss of C3H7 to form the ion of m/e 221 is a minor process, the main fragmentation reaction involving a central fission to form an ion of m/e 152 analogous to the ion of m/e 150 from I. This change in the spectrum is shown to be consistent with predictions based on the quasi-equilibrium theory of mass spectra.

Mass Spectrometry as a Tool for the Determination of Heats of Tautomerization of Thioamides in the Gas Phase

2005 ◽  
Vol 11 (1) ◽  
pp. 53-63 ◽  
Author(s):  
P.E. Allegretti ◽  
C.B. Milazzo ◽  
J.J.P. Furlong
Keyword(s):  
Mass Spectrometry ◽  
Gas Phase ◽  
Electron Energy ◽  
Temperature Effects ◽  
Mass Spectra ◽  
Theoretical Calculations ◽  
Neutral Species ◽  
Empirical Results ◽  
Semi Empirical

Tautomerism of several thioamides was studied by mass spectrometry. The analysis of the corresponding mass spectra allowed some fragmentations to be assigned to specific tautomers and heats of tautomerization to be determined through temperature effects and electron energy studies. Experimental determinations were strongly supported by theoretical calculations. AM1 semi-empirical results indicate that the thioamide–thioimidol equilibrium can be studied by mass spectrometry. Also, additional evidence was obtained regarding tautomerism occurrence between neutral species.

Mass spectra of molecules and radiation chemistry

1962 ◽  
Vol 11 (11) ◽  
pp. 1857-1864 ◽  
Author(s):  
N. N. Tunitskii ◽  
S. E. Kupriyanov ◽  
A. A. Perov
Keyword(s):  
Mass Spectra ◽  
Radiation Chemistry
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