Femtosecond time-resolved probing of desorption

Judith A. Prybyla; Harry W.K. Tom

doi:10.1117/12.148514

2 July 1993 Femtosecond time-resolved probing of desorption

Judith A. Prybyla, Harry W.K. Tom

Proceedings Volume 1857, Lasers and Optics for Surface Analysis; (1993) https://doi.org/10.1117/12.148514
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

The laser-induced desorption of CO molecules from a Cu(111) surface is probed with 100 fsec time-resolution. This is accomplished in a pump-probe scheme using surface second harmonic generation as the probe. We find that the desorption reaction is completed in -18 cm²) desorption is a novel one: the transient hot substrate electrons (T_electron,max approximately 3600 K, while T_lattice,max approximately 160 K) drive multiple electronic excitation-de-excitation cycles of the CO-Cu complex within the vibrational relaxation time. This vibrationally pumps the molecules into desorbing.

Citation Download Citation

Judith A. Prybyla and Harry W.K. Tom "Femtosecond time-resolved probing of desorption", Proc. SPIE 1857, Lasers and Optics for Surface Analysis, (2 July 1993); https://doi.org/10.1117/12.148514

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