Abstract
The intense (10 12 W cm −2, 800 nm) near-infrared laser desorption of benzene adsorbed on Pt{111} is reported. Velocity distributions are measured up to an adsorbate coverage of 20 monolayers. The velocity distributions reveal up to three distinct features: a hyperthermal feature with translational energy of 0.2 eV, a thermal feature and a subthermal feature. The translational energy of the hyperthermal feature is relatively independent of coverage and maintains constant desorption intensity from 4 to 20 ML. Experiments employing layered films of C 6H 6 and C 6D 6 reveal that the hyperthermal feature originates in the layers closest to the multilayer–vacuum interface.
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