Alkali D-line absorption in the luminescence spectrum of solid-fluid interfaces under high-intensity laser excitation.
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.
Yoo
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Alfano
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RR