PARTIAL CROSS-SECTIONS FOR THE PHOTODETACHMENT OF METASTABLE HE-

Partial cross sections for the photodetachment of a 2s or 2p electron from metastable (1s2s2p)4P He- ions have been determined using crossed-beam photoelectron spectroscopy. Kinematic effects associated with detachment from a fast beam source have been exploited, in a novel way, to enhance the precision of the measurements. Calculated cross sections for the photodetachment of H- were used to establish a scale for the He- measurements. Radiative attachment cross sections from the photodetachment results using the principle of detailed balance. © 1990 The American Physical Society.