Physics – General Physics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phrva..25.2485a&link_type=abstract
Physical Review A - General Physics, 3rd Series, vol. 25, May 1982, p. 2485-2498.
Physics
General Physics
62
Electron Impact, Fluorescence, Hydrogen, Lyman Spectra, Molecular Spectra, Ultraviolet Radiation, Molecular Excitation, Molecular Oscillations, Photomultiplier Tubes, Spectral Bands
Scientific paper
The vacuum ultraviolet electron-impact-induced fluorescence emissions of H2 were studied for the Lyman and Werner band systems in the range of 120-170 nm, using an optical system containing a photomultiplier and a spectrometer, over an energy range from threshold to 400 eV. The emission cross sections for the Lyman and Werner transitions at 100 eV are determined. The cross-section ratio is in excellent agreement with theoretical calculations and experimental data for the optical oscillator strengths. The cross-section for cascading to the B state is stated as a percentage of the total emission cross section at both 100 and 300 eV, increasing substantially at 20 eV. The vibrational population distribution of the B state is found to be a function of electron-impact energy as the importance of cascading relative to direct excitation changes with electron-impact energy.
Ajello Joseph M.
Srivastava Satish K.
Yung Yuk L.
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