Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...614.1132l&link_type=abstract
The Astrophysical Journal, Volume 614, Issue 2, pp. 1132-1142.
Astronomy and Astrophysics
Astronomy
11
Molecular Data
Scientific paper
A general model, based on a theoretically calculated ionization oscillator strength and an experimentally determined excitation shape function, has been obtained for calculating the molecular hydrogen electron-impact ionization cross section of a transition between any discrete vibrational levels of the neutral X1Σ+g state and ionic X2Σ+g state. Specifically, the excitation shape function and ionization oscillator strength for transitions from the vi=0 level of the X1Σ+g neutral state to the discrete levels of the X2Σ+g ionic state are derived from analyzing several experimental measurements. The derived oscillator strength is found to be consistent with the 1994 photoabsorption measurements of Samson & Haddad and the 1977 theoretical cross sections of Flannery and coworkers. The derived excitation function, along with the oscillator strengths for transitions involving the vi>0 level calculated from the data of Flannery and coworkers, permits an accurate calculation of the nondissociative cross sections of H2 between any discrete vibrational levels over a wide energy range.
Liu Xianming
Shemansky Donald E.
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