<title>State-selective study of photodesorption at modified metal surfaces</title>

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ABSTRACT Photon stimulated desorption of NO molecules at modified Pt(iii) surf&es are investigated by reflection-absorptioninfrared spectroscopy (RAIRS) and resonance-enhanced multiphoton ionization (REMPI). The initial adsorptionstate of NO is probed by RAIRS and the final-state distribution is measured by REMPI. Coadsorption with N, 0,and Ge atoms on Pt(111) appreciably influences the initial adsorption state of NO and the final-state distributionof photodesorbed NO. The rotational temperatures are substantially lowered by coadsorptioii with 0 and N atoms.Effects of initial geometric and electronic states on the desorption dynamics are discussed.Keywords: Photon stimulated desorption, Platinuni, Nitrogen oxides, Resonance-enhanced multiphoton ionization (REMPI), Infrared spectroscopy 1. INTRODUCTION Solid surfaces interacting with gas molecules are systems of interest and importance in fundamental science andtechnological applications. A variety of interesting surface phenomena originate from the dynamic properties ofthe system. The interaetion of the NO molecule with metal surfaces has been extensively studied in the field of

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