Abstract
The time response of excited-state sodium desorption from NaF and NaCl has been investigated with synchrotron-radiation pulses. The decay curve of the Na D-line intensity from a desorbed excited-state sodium atom is found to consist of a fast component in the ns range and a slow component between 178 ns and 3 ms. This successful observation of the time response of excited-state alkali desorption suggests there are two types of desorption mechanism, a slow one originating from the thermal instability of surface defects and a fast one due to the lattice instability induced by an electronic transition in the surface layer.
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