Ultrafast laser excitation of CO/Pt(111) probed by sum frequency generation: coverage dependent desorption efficiency

CO photodesorption from Pt(111) induced by femtosecond laser pulses is probed by IR+visible sum frequency generation (SFG). Steady state analysis of SFG spectra at varying CO pressure and laser fluence allows one to measure a approximately 5 orders of magnitude decrease of the photodesorption rate c...

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Bibliographic Details
Published in:Physical review letters 2004-05, Vol.92 (21), p.216102-216102, Article 216102
Main Authors: Fournier, Frédéric, Zheng, Wanquan, Carrez, Serge, Dubost, Henri, Bourguignon, Bernard
Format: Article
Language:English
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Summary:CO photodesorption from Pt(111) induced by femtosecond laser pulses is probed by IR+visible sum frequency generation (SFG). Steady state analysis of SFG spectra at varying CO pressure and laser fluence allows one to measure a approximately 5 orders of magnitude decrease of the photodesorption rate constant when CO coverage decreases from 0.37 to 0.07 monolayer. We ascribe this effect in the framework of the Menzel-Gomer-Redhead mechanism to electron delocalization in the CO layer. The lifetime of electronic excitation decreases when coverage decreases.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.92.216102