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Proceedings Paper

Surface studies using nonlinear spectroscopy with tunable picosecond pulses
Author(s): J. Loebau; Alfred Laubereau
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Paper Abstract

Chemisorbed films of octadecyltrichlorosilane (OTS) and ethyltrichlorosilane (ETS) at the interface calcium fluoriderair have been studied by vibrationally resonant IR pump IR-vis probe sum-frequency (SF) spectroscopy. Using a total internal reflection geometry, a signal enhancement of more than two orders of magnitude compared to the conventional setup is achieved. This enhancement in combination with two independently continuously tunable in- dielectric surfaces. A fast energy exchange between the CH3-stretching modes detected by SF spectroscopy occurs within a few picoseconds. A two-exponential decay of the CH3-stretching modes is observed: the energy relaxation is fast with time constants in the picosecond range, while the ground sate is repopulated in approximately 100ps. of a SF-active mode can be achieved, even if the pumped mode does not directly contribute to the SF spectrum. This weakening of the selection rules in IR pump IR-vis probe SF spectroscopy is demonstrated for the methylene stretching vibrations of OTS.

Paper Details

Date Published: 30 December 1998
PDF: 12 pages
Proc. SPIE 3683, Laser Optics '98: Superstrong Laser Fields and Applications, (30 December 1998); doi: 10.1117/12.334804
Show Author Affiliations
J. Loebau, Technische Univ. Muenchen (Germany)
Alfred Laubereau, Technische Univ. Muenchen (Germany)

Published in SPIE Proceedings Vol. 3683:
Laser Optics '98: Superstrong Laser Fields and Applications
Alexander A. Andreev, Editor(s)

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