Journal ArticleDOI
HIGH-RESOLUTION STUDY OF ELECTRON-IMPACT SPECTRA AT KINETIC ENERGIES BETWEEN 33 AND 100 eV AND SCATTERING ANGLES TO 16--.
TLDR
An electrostatic lens system which compensates for chromatic aberration has been tested in an electron spectrometer and the results indicate that this lens is suitable for comparisons of peak intensities in electron impact spectra.Abstract:
An electrostatic lens system which compensates for chromatic aberration has been tested in an electron spectrometer. The results indicate that this lens is suitable for comparisons of peak intensities in electron‐impact spectra. Relative intensities in vibrational progressions that belong to a single electronic transition have been studied in N2, CO, and NH3 and found to be nearly independent of the scattering angle. Electron‐impact spectra have been reported for helium, nitrogen, oxygen, argon, nitric oxide, nitrous oxide, ammonia, water vapor, carbon dioxide, ethylene, acetylene, and benzene at electron kinetic energies between 33 and 100 eV. Spectral regions of special interest are encountered in CO2 and C6H6. At excitation energies of 7–10 eV in CO2 a change in intensity distribution, attributed to transition from an electric‐quadrupole to an electric‐dipole spectrum, is observed as the kinetic energy is raised. In the case of C6H6 a change in the spectrum with angle is encountered which strongly sugg...read more
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Journal ArticleDOI
Inelastic Collisions of Fast Charged Particles with Atoms and Molecules-The Bethe Theory Revisited
TL;DR: In this article, the Bethe theory has been updated with a number of new developments which need to be included in that body of material, such as the ${z}^{3}$ effect and the stopping power for particles at extreme relativistic energies.
Journal ArticleDOI
Resonances in Electron Impact on Diatomic Molecules
TL;DR: In this article, the energies, configuration, and other properties of resonances (also called "compound states" and "temporary negative ions") in diatomic molecules are presented in the form of tables and energy level diagrams.
Inelastic collisions of fast charged particles with atoms and molecules the Bethe theory revisited
TL;DR: In this paper, the Bethe theory has been updated with a number of new developments which need to be included in that body of material, such as the ${z}^{3}$ effect and the stopping power for particles at extreme relativistic energies.
Journal ArticleDOI
Electron scattering by molecules II. Experimental methods and data
TL;DR: A survey of the available experimental cross section data is presented in this article, where the emphasis is on elastic scattering, rotational, vibrational and electronic excitations, total electron scattering, and momentum transfer in the few eV to few hundred eV impact energy range.
Journal ArticleDOI
Study of triplet states and short-lived negative ions by means of electron impact spectroscopy
TL;DR: The trochoidal electron spectrometer as discussed by the authors is a recently developed type of instrument, capable of measuring electron transmission spectra and also inelastic cross sections (a superposition of 0° and 180° scattering).
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