1005. Excitation of the CO fourth positive band system by electron impact on carbon monoxide and carbon dioxide

The mass spectra of representative series of simple alkyl acetoacetates, alkyl acetothioacetates, and some unsaturated esters derived from unsaturated alcohols or phenols are reported and discussed. The fragmentation schemes have been established by high resolution measurements, appropriate metastable ions, and by deuterium and 18O labelling. Many of the spectra show significant skeletal rearrangement fragments arising from either loss of carbon monoxide or carbon dioxide.

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UV Study of the Fourth Positive Band System of CO and Oi135.6 nm From Electron Impact on CO and CO2

Journal of Geophysical Research Space Physics ◽

10.1029/2018ja026308 ◽

2019 ◽

Cited By ~ 3

Author(s):

J. M. Ajello ◽

C. P. Malone ◽

J. S. Evans ◽

G. M. Holsclaw ◽

A. C. Hoskins ◽

...

Keyword(s):

Electron Impact ◽

Band System ◽

Positive Band

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Electron-impact excitation of the second positive band system (C3Πu→B3Πg) and theC3Πuelectronic state of the nitrogen molecule

Physical Review A ◽

10.1103/physreva.53.2239 ◽

1996 ◽

Vol 53 (4) ◽

pp. 2239-2247 ◽

Cited By ~ 43

Author(s):

John T. Fons ◽

R. Scott Schappe ◽

Chun C. Lin

Keyword(s):

Electron Impact ◽

Band System ◽

Nitrogen Molecule ◽

Impact Excitation ◽

Electron Impact Excitation ◽

Positive Band

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Mechanism for production of the Fourth Positive Band System of CO by electron impact on CO2

Journal of Geophysical Research Atmospheres ◽

10.1029/ja076i016p03733 ◽

1971 ◽

Vol 76 (16) ◽

pp. 3733-3737 ◽

Cited By ~ 45

Author(s):

M. Krauss ◽

S. R. Mielczarek ◽

D. Neumann ◽

C. E. Kuyatt

Keyword(s):

Electron Impact ◽

Band System ◽

Positive Band

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Dissociative excitation of metastable fragments by electron impact on carbonyl sulphide, carbon dioxide and carbon monoxide

Journal of Physics B Atomic Molecular and Optical Physics ◽

10.1088/0953-4075/25/6/021 ◽

1992 ◽

Vol 25 (6) ◽

pp. 1307-1320 ◽

Cited By ~ 12

Author(s):

S M Barnett ◽

N J Mason ◽

W R Newell

Keyword(s):

Carbon Dioxide ◽

Carbon Monoxide ◽

Electron Impact ◽

Dissociative Excitation ◽

Carbonyl Sulphide

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Inelastic scattering of high energy electrons by atmospheric gases

Canadian Journal of Chemistry ◽

10.1139/v69-286 ◽

1969 ◽

Vol 47 (10) ◽

pp. 1733-1774 ◽

Cited By ~ 85

Author(s):

Edwin N. Lassettre

Keyword(s):

Carbon Dioxide ◽

Carbon Monoxide ◽

Inelastic Scattering ◽

Electron Impact ◽

Cross Sections ◽

High Energy ◽

Oscillator Strengths ◽

Atmospheric Gases ◽

High Energy Electrons ◽

Forbidden Transitions

Inelastic scattering of electrons by nitrogen, oxygen, carbon monoxide, carbon dioxide, water, argon, and helium is reviewed. Electron impact spectra at both high (less than 40 keV) and low (greater than 15 eV) kinetic energies are presented and discussed. Collision cross sections and generalized oscillator strengths are described, when data are available, and the connection with optical oscillator strengths is discussed. The limiting selection rules which hold in the excitation of atoms and molecules by electron impact are discussed and typical examples of forbidden transitions are described.

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Mass Spectra of Some Tropolones and Tropolone Methyl Ethers

Canadian Journal of Chemistry ◽

10.1139/v72-128 ◽

1972 ◽

Vol 50 (6) ◽

pp. 821-825 ◽

Cited By ~ 6

Author(s):

J. L. C. Wright ◽

W. D. Jamieson ◽

S. Safe ◽

L. C. Vining

Keyword(s):

Carbon Dioxide ◽

Carbon Monoxide ◽

Electron Impact ◽

Mass Spectra ◽

Formyl Radical ◽

Sequential Loss ◽

Ion Stability ◽

Hydrogen Radical ◽

Fragmentation Patterns ◽

Competing Reactions

The mass spectra and fragmentation patterns of several tropolones and tropolone methyl ethers are reported. Deuteration studies confirmed that elimination of a formyl radical from 2-methoxytropone upon electron impact involves a specific rearrangement of the methoxyl group but sequential loss of carbon monoxide and a hydrogen radical from the ring are competing reactions. They also showed that in a dimethyl ether of anhydrosepedonin elimination of a formyl radical is completely suppressed. In the methyl ether of stipatatonic acid elimination of carbon monoxide is followed by expulsion of carbon dioxide with no loss of 29 mass units. The mass spectrum of [8-13C]-anhydrosepedonin as well as the energy spectrum for sepedonin have been investigated. These results not only provide a plausible account of the fragmentation of tropolones following electron impact but also illustrate the effect of product ion stability in determining which among a number of alternative modes of fragmentation will be more probable.

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