Coherent processes at surfaces: Free-induction decay and photon echo of the Si-H stretching vibration for H/Si(111)

Abstract

Using short infrared pulses and sum-frequency up-conversion, the dephasing of the transient polarization of the Si-H adsorbate-substrate vibration is followed in real time. At 120 K, dephasing due to homogeneous linewidth or inhomogeneous broadening are separated.