1991/10/01 by Philippe Guyot‐Sionnest · 1 citation
Physics and Astronomy · #Spectroscopy and Quantum Chemical Studies #Advanced Chemical Physics Studies #Photorefractive and Nonlinear Optics
paper · doi:10.1103/physrevlett.67.2323
openalex publication_date 1991/10/01 · openalex created_date 2016/06/24 · openalex updated_date 2025/11/06
The v_1\ensuremath→2 hot band of the Si-H stretching vibration of the H/Si(111) 1\ifmmode×\else\texttimes\fi1 surface is investigated using picosecond sum-frequency generation. The hot band is probed after directly exciting the fundamental v_0\ensuremath→1 and found to be 90 cm^\mathrm\ensuremath-1 lower than the fundamental. The shift is consistent with the Si-H anharmonicity in the gap phase and a small dispersion (11 cm^\mathrm\ensuremath-1) for the surface layer, implying a strong two-phonon bound state.