Abstract
The photostimulated desorption of NO chemisorbed on Pt(001) at 80 K is studied with an s-polarized ArF excimer laser (λ = 193 nm, 6.41 eV) and a (1 + 1)-resonance-enhanced multiphoton ionization technique. The internal energies up to 1000 cm −1 for desorbed NO in the X 2Π 1 2 (v = 0) and X 2Π 3 2 (v = 0) states are found to be nearly Boltzmann with rotational temperatures of 303 and 283 K, respectively. In the higher energy region ( > 1000 cm −1), however, the internal energies deviate from the Boltzmann distribution to a higher rotational temperature. The mechanism of photostimulated desorption is discussed.
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