M. Saß, J. Löbau, M. Lettenberger
Sep 17, 1999
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Influential Citations
13
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Journal
Chemical Physics Letters
Abstract
Abstract Chemisorbed films of ethyltrichlorosilane (ETS) at the glass/air interface are studied by IR-excitation sum-frequency (SF) spectroscopy. Using two independently tunable infrared pulses in combination with a visible upconversion pulse for the SF-probing process, a time-resolved vibrational spectroscopy is accomplished for the molecular monolayer at the dielectric surface. Rapid energy transfer in the CH-stretching region is observed with a time constant of 1.5±1 ps. The population relaxation of the CH 3 -stretching modes is found to be bimodal with a decay time of T 1 =4.5±1 ps, while the ground state is re-populated rather slowly with 130±50 ps.