J. Phys. Chem. B, 108 (5), 1525 -1528, 2004. 10.1021/jp037240w S1089-5647(03)07240-7
Web Release Date: January 9, 2004

Copyright © 2004 American Chemical Society

Time-Domain Raman Measurement of Molecular Submonolayers by Time-Resolved Reflection Spectroscopy

Satoru Fujiyoshi, Taka-aki Ishibashi,* and Hiroshi Onishi

Surface Chemistry Laboratory, Kanagawa Academy of Science and Technology (KAST), KSP East 404, 3-2-1 Sakado, Takatsu, Kawasaki 213-0012, Japan, Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, 4-1-8 Honmachi, Kawaguchi 332-0012, Japan

Received: October 27, 2003

In Final Form: November 27, 2003

Abstract:

Femtosecond time-resolved photoinduced reflectance change was measured on a spin-coated dye (cresyl violet) of submonolayer coverage (4 × 1013 cm-2) on a fused silica substrate. We found that the sensitivity of the reflection measurement was much higher than that of the absorption measurement for thin monolayers of dye. A prominent beating structure due to vibrational coherence of the dye was observed on the time-resolved reflection signal. A vibrational spectrum of the dye at submonolayer coverage, which corresponded to its resonance Raman spectrum, was obtained in the range 0-800 cm-1 by a Fourier transform analysis of the reflection signal.

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