Abstract
The excitation energy dependence of excited-state Na desorption from NaF and NaCl has been investigated in the energy range of 20–47 eV with synchrotron radiation. The excited-state Na desorption from NaF was observed with valence-band excitation as well as core-level excitation. The excitation spectra of excited-state Na desorption from NaF and NaCl showed a peak corresponding to the Na L 2,3 core-exciton band. Contributions of core-level and valence-band excitations to the Na desorption at the Na L 2,3 core-exciton band were estimated by using the absorption and excitation spectra. The present results indicate that the Knotek-Feibelman mechanism based on core-level excitation is not valid to explain the excited-state alkali desorption. The desorption with valence-band and core-level excitations showed the similar time response having two components, indicating the two PSD models which correspond to the instability induced by electronic excitations in the surface layer and the thermal instability of surf...
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