1994 Volume 63 Issue 3 Pages 1053-1058
The time response of excited-state potassium desorption from KCl and KBr was investigated with undulator radiation pulses. It was found that the decay curve of the optical emission from desorbed excited-state potassium atoms consists of two components, and that the fast component is several orders of magnitude faster than the existing results of time response for ground-state alkali atoms. It is suggested that the fast desorption of excited-state alkali atoms may be interpreted in terms of lattice instability due to electronic excitation in the surface layer, while a slow one originates from the thermal instability of surface defects.
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