Translational energy and desorption rate of NO from Pt(111) by femtosecond laser pulses

Robert A. Pelak; M. F. Booth; D. G. Busch; Shiwu Gao; Wilson Ho

doi:10.1117/12.221466

25 September 1995 Translational energy and desorption rate of NO from Pt(111) by femtosecond laser pulses

Robert A. Pelak, M. F. Booth, D. G. Busch, Shiwu Gao, Wilson Ho

Proceedings Volume 2547, Laser Techniques for Surface Science II; (1995) https://doi.org/10.1117/12.221466
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

Photodesorption of nitric oxide from Pt(111) using femtosecond laser pulses at 620 nm and 310 nm is found to result in a superlinear dependence of desorption yield on absorbed laser fluence. The translational energy distributions of the desorbed molecules are found to be nearly Maxwell-Boltzmann. For both 620 nm and 310 nm pulses with adsorbed fluences greater than 2.5 mJ/cm², the average translational energy is found to increase linearly. At lower fluences, it is constant at 750 K, possibly suggesting a transition between DIMET and DIET desorption processes. In two pulse correlation measurements, it is found that the first pulse yield and the average translational energy have different widths as a function of delay between pulses.

Citation Download Citation

Robert A. Pelak, M. F. Booth, D. G. Busch, Shiwu Gao, and Wilson Ho "Translational energy and desorption rate of NO from Pt(111) by femtosecond laser pulses", Proc. SPIE 2547, Laser Techniques for Surface Science II, (25 September 1995); https://doi.org/10.1117/12.221466

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