Abstract

Photoluminescence spectra from the high-Tc superconductor YBa2Cu3O7−x, the semiconductor GaAs, and GaP under intense picosecond laser excitation were studied with their surfaces exposed to different alkali solutions. Strong absorption of D lines of neutral-alkali atoms was observed in these spectra. These absorption lines indicate that free ground-state alkali atoms were formed by recombination of the sublimated alkali ions with photoelectrons through various processes.

© 1989 Optical Society of America

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