HIGH RESOLUTION ELECTRON IMPACT STUDY OF THE FUV EMISSION SPECTRUM OF $H_{2}$
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Date
1995
Journal Title
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Publisher
Ohio State University
Abstract
The emission spectrum of molecular hydrogen produced by electron impact excitation at 100eV has been measured in the wavelength range $1140 to 1675 {\AA}$. High resolution optically thin spectra $(\Delta \lambda = 0.136{\AA})$ of the FUV Lyman and Werner band systems have been obtained with a newly constructed 3 meter spectrometer. Synthetic spectral intensities based on the transition probabilities calculated by Abgrall et al are in very good agreement with experimentally observed $intensities^{1}$. Previous modeling utilizing Allison and Dalgarno band transition probabilities with Honl-London factors breaks down when the transition moment has significant J dependence or when rotational-vibrational coupling is $significant^{2}$. Ro-vibronic perturbation between $/nu = 14$ of the $B {^{1}{\Sigma^{+}}_{u}}$ state and $/nu = 3$ of the $C {^{1}\Pi_{u}}$ state and the rotational dependence of the transition moment in the (6, 12) and (7, 13) bands of the Lyman system are examined. High resolution reference experimental FUV spectra, together with the model synthetic spectra based on the Abgrall transition probabilities will be presented.
Description
1. H. Abgrall H., E. Roueff, F. Launay, J.-Y Roncin, and J.L. Subtil, Astron. Astrophys. Suppl. Ser., 101, 273 (1993); 101 323 (1993). 2. A. C. Allison, and A. Dalgarno, At. Data, 1, 289 (1970)
Author Institution: California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109-8099.
Author Institution: California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109-8099.