Photon-Stimulated Desorption of Excited-State Sodium Atom from NaF and NaCl under Valence-Band and Core-Level Excitations

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The excitation energy dependence of excited-state Na desorjction from NaF and Nail hasbeen 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-levelexcitation. The excitation spectra of excited-state Na desorption from lNaF and Nail showed apeak corresponding to the Na L2,3 core-exciton band. Contributions of core-level and valence-band excitations to the Na desorption at the Na L2,3 core-exciton band were estimated byusing 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-statealkali desorption. The desorption with valence-band and core-level excitations showed the similartime response having two conuponents, indicating the two PSD rnodels which correspond to theinstability induced by electronic excitations in the surface layer and the thermal instability ofsurface defects, respectively.
社団法人日本物理学会の論文
1996-06-15