Width cross-sections for collisional broadening of s–p and p–s transitions by atomic hydrogen

Authors:
  • SAS. D. Anstee
    S. D. Anstee
  • BOB. J. O’mAra
    B. J. O’mAra
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Abstract
Tables of width cross-sections are presented for the broadening of general s-p and p-s atomic transitions by collisions with neutral atomic hydrogen. The transitions are characterized by the effective principal quantum numbers of the s and p states. Each cross-section is given for a relative velocity of 104 m s –1 together with an exponent α calculated on the assumption that the cross-section varies with velocity as v-α. The cross-sections were calculated using the methods described by the authors in a previous paper. The cross-sections are tested by using them in the synthesis of a selection of strong solar lines of sodium, calcium and iron with well-determined f-values. The abundances derived from the strong lines are consistent with the meteoritic values.