Ionization Potentials of Free Radicals Formed by Electron Impact. Methylstannyl Radicals

1968 ◽  
Vol 49 (7) ◽  
pp. 2949-2953 ◽  
Author(s):  
F. W. Lampe ◽  
A. Niehaus
Keyword(s):  
Free Radicals ◽  
Electron Impact ◽  
Ionization Potentials

FREE RADICALS BY MASS SPECTROMETRY: X. THE IONIZATION POTENTIALS OF METHYL SUBSTITUTED ALLYL RADICALS

1956 ◽  
Vol 34 (3) ◽  
pp. 345-353 ◽  
Author(s):  
C. A. McDowell ◽  
F. P. Lossing ◽  
I. H. S. Henderson ◽  
J. B. Farmer
Keyword(s):  
Mass Spectrometry ◽  
Free Radicals ◽  
Electron Impact ◽  
Heat Of Formation ◽  
Ionization Potentials ◽  
Bond Dissociation Energies ◽  
Allyl Radical ◽  
Dissociation Energies ◽  
Allyl Halides ◽  
Vertical Ionization Potentials

The vertical ionization potentials of the β- and γ-methyl substituted allyl radicals as measured by electron impact are 8.03 ± 0.05 v. and 7.71 ± 0.05 v, respectively. From appearance potential data the following bond dissociation energies can be derived, assuming the dissociation processes to be free from complications:[Formula: see text]With assumptions about the structure of the ions produced by electron impact from the corresponding butenes the dissociation energies of the C4H7—H bonds in these latter compounds can be estimated, and the heats of formation of the corresponding radicals derived, namely:[Formula: see text]From data on the allyl halides we evaluate the heat of formation of the allyl radical to be:[Formula: see text]

FREE RADICALS BY MASS SPECTROMETRY: VII. THE IONIZATION POTENTIALS OF ETHYL, ISOPROPYL, AND PROPARGYL RADICALS AND THE APPEARANCE POTENTIALS OF THE RADICAL IONS IN SOME DERIVATIVES

1955 ◽  
Vol 33 (5) ◽  
pp. 861-869 ◽  
Author(s):  
J. B. Farmer ◽  
F. P. Lossing
Keyword(s):  
Mass Spectrometry ◽  
Thermal Decomposition ◽  
Free Radicals ◽  
Kinetic Energy ◽  
Electron Impact ◽  
Ionization Potentials ◽  
Bond Dissociation Energies ◽  
Radical Ions ◽  
Dissociation Energies ◽  
Propargyl Radicals

The ionization potentials of ethyl, isopropyl, and propargyl radicals have been measured by electron impact on radicals produced by thermal decomposition of appropriate compounds. The values are:ethyl 8.78±0.05 ev., isopropyl 7.90±0.05 ev., and propargyl 8.25±0.08 ev. From the appearance potentials of these ions in various compounds, the following values of bond dissociation energies were obtained:[Formula: see text][Formula: see text] assuming no kinetic energy of the products.

IONIZATION POTENTIALS OF ALKYL FREE RADICALS AND n-ALKANES THROUGH C17H36 BY ENERGY-CALIBRATED MOLECULAR ORBITAL METHODS

1966 ◽  
Vol 44 (12) ◽  
pp. 1455-1462 ◽  
Author(s):  
Charles E. Melton ◽  
Hubert W. Joy
Keyword(s):  
Experimental Data ◽  
Free Radicals ◽  
Molecular Orbital ◽  
Ionization Potentials ◽  
Recent Experimental Data ◽  
Normal Alkanes ◽  
Atomic Orbitals ◽  
Large Molecules ◽  
Good Agreement ◽  
Expansion Scheme

Ionization potentials are calculated by simple energy-calibrated molecular orbital techniques for the normal alkanes through C17H36 and for some normal and branched alkyl free radicals. A model is formulated which allows the computations to be extended to extremely large molecules by using "radical" orbitals as well as atomic orbitals in the expansion scheme. Auto-ionization levels as well as ionization potentials are calculated for the radicals. Computed and observed values are in good agreement where recent experimental data are available.

THE IONIZATION POTENTIALS OF MONOSUBSTITUTED PYRIDINES BY ELECTRON IMPACT

1963 ◽  
Vol 67 (7) ◽  
pp. 1551-1554 ◽  
Author(s):  
Michael R. Basila ◽  
Donald J. Clancy
Keyword(s):  
Electron Impact ◽  
Ionization Potentials

Electron impact ionization of the SiDx (x=1–3) free radicals

1996 ◽  
Vol 105 (15) ◽  
pp. 6315-6321 ◽  
Author(s):  
V. Tarnovsky ◽  
H. Deutsch ◽  
K. Becker
Keyword(s):  
Free Radicals ◽  
Electron Impact ◽  
Impact Ionization ◽  
Electron Impact Ionization
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