Abstract
A long-standing question in surface studies of metals concerns the relative roles of substrate electrons and phonons in coupling to different adsorbate degrees of freedom. Independent control over these channels could provide valuable insights. The excitation of the metal by femtosecond light pulses allows us to approximate this condition. Ultrafast laser-pulse absorption leads to nonequilibrium excitation described by high transient electronic temperatures (thousands of degrees) with only a modest rise in the lattice temperature. We have previously reported studies of the desorption of NO from a Pd(111) surface under such conditions in which the results indicated an electronic desorption mechanism.1 In this paper we report results for the O2/ Pd(111) system under femtosecond illumination.
© 1993 Optical Society of America
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