Nanosecond Time-Resolved Infrared Spectroscopy with a Dispersive Scanning Spectrometer

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Abstract:

A nanosecond time-resolved infrared spectroscopic system based on a dispersive scanning spectrometer has been constructed. This is an advanced version of a similar system reported in a previous paper; the time resolution has been improved from 1 μs to 50 ns and the sensitivity from 10-4 in intensity changes to 10-6. These have been achieved by the use of a high-temperature ceramic infrared light source, a photovoltaic MCT detector, and a low-noise, wide-band preamplifier developed specifically for the present purpose. Time-resolved infrared spectra of a few samples of photochemical and photobiological interests are presented to show the capability of the system. The origin of the thermal artifacts, which have been found to hamper the time-resolved infrared measurements seriously, is shown to be due to the transient reflectance change induced by a small temperature jump. The future prospect of time-resolved infrared spectroscopy is discussed with reference to other methods including infrared laser spectroscopy and Fourier transform infrared spectroscopy.

Keywords: 4-Phenylbenzophenone; Bacteriorhodopsin; Biphenyl; Phthalocyanine; Time-resolved infrared spectroscopy

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370294774368947

Affiliations: 1: Molecular Spectroscopy Laboratory, Kanagawa Academy of Science and Technology, 3-2-1 Sakato, Kawasaki 213, Japan 2: Molecular Spectroscopy Laboratory, Kanagawa Academy of Science and Technology, 3-2-1 Sakato, Kawasaki 213, Japan; permanent address: Yamazaki Works, Hitachi Chemical Co., Ltd. 4-13-1, Higashi-cho, Hitachi, Ibaraki 317, Japan 3: Molecular Spectroscopy Laboratory, Kanagawa Academy of Science and Technology, 3-2-1 Sakato, Kawasaki 213, Japan; permanent address: Department of Chemistry, University of Nottingham, Nottingham NG7 2RD, U.K.

Publication date: June 1, 1994

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