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Proceedings Paper

Study of electronic transitions by using attenuated total reflectance spectroscopy in the far-UV region
Author(s): Yusuke Morisawa; Shin Tachibana; Masahiro Ehara; Yukihiro Ozaki
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Paper Abstract

The wavelength region shorter than 200 nm, far-ultraviolet (FUV) region, is very rich in information about the electronic states and structure of a molecule. Since the molar absorption coefficient is very high (∼105 mol-1 dm3 cm-1) in the FUV region, the electronic states and structure mainly for gas molecules has been investigated for a long time. On the other hand, as to molecules in the condensed phase transmittance spectra could not measure because of high molecular density, and reflection spectroscopy has been used to observe spectra of solid samples in the FUV region. However, for liquid samples generally either absorption spectroscopy or specular reflection spectroscopy was difficult to observe. Accordingly, FUV spectroscopy for liquid samples has been a relatively undeveloped research area. To solve the above difficulties of FUV spectroscopy we have recently developed a totally new UV spectrometer based on attenuated total reflection (ATR) that enables us to measure spectra of liquid and solid samples in the 140–280 nm region. This paper shows the studies by the attenuated total reflection far-ultraviolet (ATR-FUV) spectroscopy. These investigations elucidate the electronic structure and electronic transition in the FUV region for molecules such as n- and branched alkanes, alcohols, ketones, amides, and nylons in the liquid or solid phase. The consistent assignments were performed with a help of quantum chemical calculation.

Paper Details

Date Published: 15 September 2016
PDF: 7 pages
Proc. SPIE 9926, UV and Higher Energy Photonics: From Materials to Applications, 992604 (15 September 2016); doi: 10.1117/12.2238790
Show Author Affiliations
Yusuke Morisawa, Kindai Univ. (Japan)
Shin Tachibana, Kwansei Gakuin Univ. (Japan)
Masahiro Ehara, Institute for Molecular Science (Japan)
Yukihiro Ozaki, Kwansei Gakuin Univ. (Japan)

Published in SPIE Proceedings Vol. 9926:
UV and Higher Energy Photonics: From Materials to Applications
Gilles Lérondel; Satoshi Kawata; Yong-Hoon Cho, Editor(s)

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