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Rydberg cross sections and rate coefficients in H-H collisions

B M McLaughlin and K L Bell

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Cross section calculations are carried out in the energy region 1-1024 keV to provide theoretical data on the Rydberg state formation processes H(1s)+H(1s) to H(ns,np,nd)+H( Sigma ) where n=3, 4, 5, 6, 7, 10, 12, 15, 18, 20, 22, 25, 30 and 40. The calculations are performed including electron exchange and comparisons are drawn with those carried out in the first Born approximation. Rate coefficients are evaluated from these cross sections, including those for Balmer- alpha production in the temperature range 3*102-107 K, suitable for applications in astronomy and astrophysics. At the lower temperatures, the rate coefficients should be treated with caution, because of the simplicity of the approximation used.


PACS

34.50.-s Scattering of atoms and molecules

34.70.+e Charge transfer

34.50.Fa Electronic excitation and ionization of atoms (including beam-foil excitation and ionization)

34.10.+x General theories and models of atomic and molecular collisions and interactions (including statistical theories, transition state, stochastic and trajectory models, etc.)

Subjects

Atomic and molecular physics

Dates

Issue 5 (14 March 1989)



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