WIDTH CROSS-SECTIONS FOR COLLISIONAL BROADENING OF S-P AND P-S TRANSITIONS BY ATOMIC-HYDROGEN

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 10(4) m s(-1) together with an exponent alpha calculated on the assumption that the cross-section varies with velocity as v(-alpha). 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.