Recent progress in the investigation of core hole-induced photon stimulated desorption from adsorbates: excitation site-dependent bond breaking, and charge rearrangement

SURFACE SCIENCE

卷:451

Article; Proceedings Paper

Feulner, P ; Romberg, R ; Frigo, SP ; Weimar, R ; Gsell, M ; Ogurtsov, A ; Menzel, D

关键词: carbon monoxide;    copper;    desorption induced by electronic transitions (DIET);    nitrogen atom;    photon stimulated desorption (PSD);    ruthenium;    surface photochemistry;   

DOI  :  10.1016/S0039-6028(00)00006-6

来源: Elsevier

【 摘 要 】

We report photon stimulated desorption (PSD) of neutral and ionic molecules and atoms from CO chemisorbed on Ru(001) and Cu(111), and from N(2) chemisorbed on Ru(001). Comparing branching ratios and spectral features for the O1s and N1s regions, we demonstrate that desorbing neutrals and ions are supplementary probes for the entire region of one- and multi-electron excitations, bearing valuable information on the transfer of energy and charge. For the primary [N1s]pi* excitation of N(2)/Ru(001), we find excitation site-dependent branching into desorption of N(2)(0), N(0) and N(+). PSD of neutral N atoms predominates for excitations of the N atom close to the surface, whereas mainly neutral N(2) molecules and N(+) ions are ejected for excitations of the outer N atom. At the Ru 3p substrate thresholds we find significant enhancements of the N(+) and N(2+) yields from N(2)/Ru(001), and discuss the electronic nature of the underlying energy transfer mechanism. (C) 2000 Elsevier Science B.V. All rights reserved.

【 授权许可】

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