Nonadiabatic coupling between C-O stretching and Pt substrate electrons enhanced by frustrated mode excitations

Kazuya Watanabe, Ken Ichi Inoue, Ikuyo F. Nakai, Yoshiyasu Matsumoto

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

We report the transient enhancement of coupling between adsorbate internal stretching vibration and substrate electrons induced by femtosecond laser excitation. A Pt(111) surface covered with carbon monoxide (CO) is irradiated with a 150 fs pump pulse at 400 nm. Transient changes in the imaginary part of nonlinear susceptibility in the C-O stretching region are probed by using femtosecond time-resolved infrared-visible sum-frequency generation with phase-sensitive detection. The line shape of C-O stretching shows remarkable asymmetry due to Fano interference with a continuum of electron-hole pair excitation. Excitations of CO-Pt frustrated modes play a key role in the enhancement of the nonadiabatic coupling.

Original languageEnglish
Article number241408
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number24
DOIs
Publication statusPublished - 2010 Jun 9
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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