Abstract
A mixed, thermal-energy metastable Ne(3 s 3 P 2, 3 P 0) beam is state-selected by optical excitation using a narrow-band dye laser, and ionizing collisions of the two metastable species with the closed-shell atoms Ar, Kr, Xe, and Hg are studied separately in detail by means of high-resolution (18–20 meV) electron spectrometry (PIES). The electron energy distributions for the rare-gas targets show behavior typical for van der Waals molecules, with well depths similar to those for the systems Na(3 s) + Ar, Kr, Xe. Significant differences are found between the actions of Ne( 3 P 2) and Ne( 3 P 0) with regard to the relative populations of the different ionic states. The electron spectra observed for Ne( 3 P 2) + Hg and Ne( 3 P 0) + Hg are compatible with potential curves which are very similar to those for the Na(3 s) + Hg interaction. For Ne( 3 P 0) + Hg, a sharp, unusual peak is observed in addition, and attributed to interaction with another autoionization channel.
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