Electron excitation of the H2(a 3Sigma(g)(+) - B 3Sigma(u)(+)) continuum in the vacuum ultraviolet

Details Electron excitation of the H2(a 3Sigma(g)(+) - B 3Sigma(u)(+)) continuum in the vacuum ultraviolet Electron excitation of the H2(a 3Sigma(g)(+) - B 3Sigma(u)(+)) continuum in the vacuum ultraviolet

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...407..820a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 407, no. 2, p. 820-825.

Astronomy and Astrophysics

Astrophysics

12

Atomic Excitations, Electron Energy, Hydrogen, Ultraviolet Radiation, Calibrating, Emission Spectra, Ultraviolet Spectra, Vibrational Spectra

Scientific paper

The electron excitation function for the H2(a 3Sigma(g)(+) - b 3Sigma(u)(+)) continuum emission has been measured from 11 to 30 eV at 195.0 nm. The emission cross, section data have been combined with electron energy loss cross section measurements to extend the experimental data to 60 eV. The excitation cross section has been estimated by normalizing the data to the electron energy loss cross section at 20 eV and using a model to account for emission from the entire band system. The spin forbidden excitation of the a 3Sigma(g)(+) state is a major dissociative channel of H2 at low energy with a peak cross section of 1.7 +/- 0.85 x 10 exp -17 sq cm at 15.5 eV. The FWHM of the cross section is 7 eV. The high energy dependence of the cross section has a rapid 1/E-cubed fall off with electron energy, E, above 50 eV. A modified Born approximation analysis was applied to the data to provide an analytic model.

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