Abstract
Results of semiempirical, adiabatic hyperspherical calculations are presented for the photodetachment cross section of the process H[sup [minus]] 2[ital p][sup 2]([sup 3][ital P][sup [ital e]])+[gamma][r arrow]H([ital n]=2)+[ital e][sup [minus]] at photon energies in the range from threshold to 0.125 a.u. above. We find the detachment cross section to have a maximum value of 482 Mb at 25.7 meV above threshold, in good agreement with results of close-coupling calculations by Jacobs, Bhatia, and Temkin [Astrophys. J. 242, 1278 (1980)]. In contrast to the close-coupling results, however, we find that the detachment cross section rises by a factor of more than 400 from its threshold value to its maximum.
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