UV Pulsed Laser Desorption from Ag/Al/Sapphire Films: Changes in the Ion Desorption Process for Excitations near the Ag d-Band Threshold
Energetic ion species desorption from Al(200nm)/sapphire, Ag(10nm)/Al(200nm)/sapphire and Al(111) targets has been measured tor 244 and 320 nm laser irradiation. The product kinetic energy distribution (KED) for samples irradiated with 244 nm light, for Ag+ and the impurity species K+ resemble the KED of Al+ desorbed from Al(111) and Al/sapphire (< KE > ≈3–4 eV). However, for resonance excitation (320 nm) of the Ag adlayer, all product KEDs shift to lower energy (< KE > ≤1 eV). These results imply that the excitation which leads to ion KE is not due to a local excitation process.
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