Infrared response of chemisorbed CO to femtosecond metal substrate heating

Arjun G. Yodh; Joseph P. Culver; M. Li; L. G. Jahn; Robin M. Hochstrasser

doi:10.1117/12.180849

21 July 1994 Infrared response of chemisorbed CO to femtosecond metal substrate heating

Arjun G. Yodh, Joseph P. Culver, M. Li, L. G. Jahn, Robin M. Hochstrasser

Author Affiliations +

Proceedings Volume 2125, Laser Techniques for Surface Science; (1994) https://doi.org/10.1117/12.180849
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

Time resolved IR spectroscopy is used to monitor the stretch mode of CO on Cu(111) following femtosecond visible excitation. A time dependent shift in the stretch mode complex frequency is observed and is attributed to low frequency adsorbate-like modes becoming excited via coupling to substrate electrons and phonons. At low levels of excitation it is found that the frustrated translation is coupling to the bulk electron reservoir with a rate (gamma) _eequals167(24) GHz, and to the bulk phonon reservoir with a rate (gamma) _Lequals145(56) GHz. At higher excitation levels deviations from the model are observed.

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Arjun G. Yodh, Joseph P. Culver, M. Li, L. G. Jahn, and Robin M. Hochstrasser "Infrared response of chemisorbed CO to femtosecond metal substrate heating", Proc. SPIE 2125, Laser Techniques for Surface Science, (21 July 1994); https://doi.org/10.1117/12.180849

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