title: Alkali D-line absorption in the luminescence spectrum of solid-fluid interfaces under high-intensity laser excitation.
abstract: Photoluminescence spectra from the high-T(c) superconductor YBa(2)Cu(3)O(7-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.
authors.forename: K M
authors.initials: KM
authors.lastname: Yoo
authors.forename: R R
authors.initials: RR
authors.lastname: Alfano