Surface photochemistry of O2 on Pt(111) with femtosecond laser pulses

Previous studies of O2 desorption and photoreaction from Pt(111)1 and Pd(111)2 upon irradiaiton with intense (>1mJ/cm2) 100fs laser pulses have observed highly nonlinear fluence dependences with power law exponents of 5 and higher. It has been proposed that multiple electronic transitions induce desorption either via coupling to transient high energy substrate electrons3 or more direct excitation.4