Infrared spectra of organic monolayer films in a standing wave measured by photon-trap spectroscopy

Kazuhiro Egashira, Akira Terasaki, Tamotsu Kondow

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11 Citations (Scopus)

Abstract

Photon-trap spectroscopy, a generalized scheme of cavity ringdown spectroscopy, is applied to measure an infrared spectrum of the C-H stretching vibration of alkylsiloxane monolayer films grafted on a silicon substrate. A continuous-wave laser beam is introduced into a high-finesse Fabry-Ṕrot cavity containing the substrate placed exactly normal to the light beam to minimize optical losses. The lifetime of the light trapped in the cavity is measured to detect optical absorption sensitively. The results show clear dependence of the absorbance on the location of the monolayers with respect to a standing wave formed in the cavity; the absorbance is practically zero when the monolayers on both the surfaces are adjusted at nodes, whereas it is maximized at antinodes. The present experiment is materialized on the basis of the principles established by our previous study [Terasaki, J. Opt. Soc. Am. B 22, 675 (2005)].

Original languageEnglish
Article number221102
JournalJournal of Chemical Physics
Volume126
Issue number22
DOIs
Publication statusPublished - Jun 27 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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