Electron impact excitation of H2 - Rydberg band systems and the benchmark dissociative cross section for H Lyman-alpha

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Abstract

view Abstract Citations (135) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Electron Impact Excitation of H 2: Rydberg Band Systems and the Benchmark Dissociative Cross Section of H Lyman-Alpha Shemansky, D. E. ; Ajello, J. M. ; Hall, D. T. Abstract The cross sections sigma R 1 (2p) for excitation of H Ly-alpha emission produced by electron impact on H2 is reexamined. A more accurate estimate for sigma R 1 (2p) is obtained based on Born approximation estimates of the H2 Rydberg system cross sections using measured relative excitation functions. The obtained value is (8.18 + or -1.2) x 10 to the -18th sq cm at 100 eV, a factor of 0.69 below the value universally applied to cross section measurements over the past decade. Cross sections for the H2 Rydberg systems fixed in magnitude by the Born approximation have also been obtained using experimentally determined excitation functions. Accurate analytic expressions for these cross sections allow the direct calculation of rate coefficients. Publication: The Astrophysical Journal Pub Date: September 1985 DOI: 10.1086/163493 Bibcode: 1985ApJ...296..765S Keywords: Electron Impact; Gas Dissociation; H Alpha Line; Lyman Spectra; Molecular Excitation; Rydberg Series; Atomic Excitations; Scattering Cross Sections; Spectral Bands; Transition Probabilities; Ultraviolet Spectra; Atomic and Molecular Physics full text sources ADS |

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