Studies of extreme-ultraviolet emission from Rydberg series of H2 by electron impact

Details Studies of extreme-ultraviolet emission from Rydberg series of H2 by electron impact Studies of extreme-ultraviolet emission from Rydberg series of H2 by electron impact

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phrva..29..636a&link_type=abstract

Physical Review A - General Physics, 3rd Series (ISSN 0556-2791), vol. 29, Feb. 1984, p. 636-653. USAF-supported research.

Astronomy and Astrophysics

Astronomy

102

Electron Impact, Hydrogen, Rydberg Series, Ultraviolet Spectroscopy, Calibrating, Cross Sections, Emission Spectra, Extreme Ultraviolet Radiation, Planetary Atmospheres, Ultraviolet Astronomy

Scientific paper

Calibrated laboratory measurements of H2 bands in the 70-170-nm region using crossed neutral and electron beams have allowed the estimation of the cross sections for H2 bands which account for virtually all of the H2 EUV band emission. It is found, in general, that the internal population structure of the directly excited EUV band systems, B-X, B'-X, C-X, D-X, and D'-X, is modeled accurately by theoretical collision strengths. Moreover, the analysis of the measurements indicates that the same constant factor at a given electron energy at or above 100 eV, relates the theoretical oscillator strengths of the systems to the cross sections to within about 15 percent. The higher-Rydberg series band systems measured have been found to be a significant factor in the analysis of EUV planetary spectra. The prominence of the E,F-B contribution at low electron impact energies is also of astrophysical importance and further work is recommended to better define the excitation parameters of the E,F system.

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