Nonthermal photodesorption of N2 from Ag(111)

R. M. Rao; R. J. Beuhler; Michael G. White

doi:10.1117/12.307122

30 April 1998 Nonthermal photodesorption of N₂from Ag(111)

R. M. Rao, R. J. Beuhler, Michael G. White

Proceedings Volume 3272, Laser Techniques for Surface Science III; (1998) https://doi.org/10.1117/12.307122
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

Abstract

We have measured translational and rotational energy distributions of N₂ molecules following desorption from a Ag(111) surface by infrared (1064 nm) radiation. The observed desorption yields were large even at laser fluences far below that required for laser-induced thermal desorption. State-resolved laser techniques using coherent VUV radiation showed that the rotational and translational energy distributions of the desorbing N₂ molecules are not consistent with the predictions of the heat diffusion model governing laser-induced surface heating. These results suggest that physisorbed adsorbates can couple directly to the nascent-phonon distribution or the nascent electron-hole pairs in the photoexcited substrate without heating of the surface.

Citation Download Citation

R. M. Rao, R. J. Beuhler, and Michael G. White "Nonthermal photodesorption of N₂from Ag(111)", Proc. SPIE 3272, Laser Techniques for Surface Science III, (30 April 1998); https://doi.org/10.1117/12.307122

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