Analytical cross sections and rate coefficients for H-H inelastic collisions

Abstract

view Abstract Citations (11) References (38) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Analytical Cross Sections and Rate Coefficients for H-H Inelastic Collisions Soon, W. H. Abstract Analytical expressions for cross sections and the corresponding Maxwellian rate coefficients for direct excitation and ionization in binary collisions of hydrogen atoms are evaluated by using the classical impulse approximation. The maximum values of the ionization and excitation cross sections and the positions of the maxima are also predicted. The classical impulse approximation cross sections were compared with available measurements and quantum-mechanical cross sections. The classical impulse approximation rate coefficients calculated were compared to the commonly used semi-empirical rate coefficients of Drawin. The comparison indicates that the commonly used semi-empirical rate coefficients are significantly higher than the classical impulse approximation rates for excitation and ionization transitions from excited levels. Publication: The Astrophysical Journal Pub Date: August 1992 DOI: 10.1086/171625 Bibcode: 1992ApJ...394..717S Keywords: Hydrogen; Inelastic Collisions; Scattering Cross Sections; Atomic Excitations; Ionization; Molecular Physics; Atomic and Molecular Physics; ATOMIC DATA; ATOMIC PROCESSES full text sources ADS |