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Development of an Near-infrared and Visible Time-resolved Spectrophotometer System

Research Project

Project/Area Number 01840016
Research Category

Grant-in-Aid for Developmental Scientific Research (B).

Allocation TypeSingle-year Grants
Research Field 物理化学一般
Research InstitutionGunma University

Principal Investigator

SHIZUKA Haruo  Gunma University, Department of Chemistry, Professor, 工学部, 教授 (40008454)

Co-Investigator(Kenkyū-buntansha) SAKIMUKAI Shinji  Unisoku Co. Ltd., Research Associate, 研究員
MUGISHIMA Akio  Unisoku Co. Ltd., Research Associate, 研究員
NAGAMURA Toshihiko  Unisoku Co. Ltd., President, 社長
HIRATSUKA Hiroshi  Gunma University, Department of Chemistry, Associate Professor, 工学部, 助教授 (00016156)
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥6,200,000 (Direct Cost: ¥6,200,000)
Fiscal Year 1990: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1989: ¥5,200,000 (Direct Cost: ¥5,200,000)
KeywordsNear-infrared emission spectrum / Near-infrared absorption spectrum / Transient absorption spectrum / Germanium photodiode detector / Time resolved spectrofluorimeter / Lifetime measurement
Research Abstract

The purpose of this research is to construct a convenient spectrophotometer system which is able to measure the absorption and emission spectra of unstable intermediates such as radicals and triplet states in near-infrared region. Because of lack of a good detector in this region, it has been difficult to measure them quantitatively and therefore the spectroscopic study in near-infrared region has stayed in an undeveloped stage.
In this research, we tried to construct a spectrophotometer system which is able to measure absorption spectro and emission specctra in visible and near-infrared region, in combination with a Nd^<3+> : YAG laser system. A photomultiplier and a germanium diode were used as the detectors in visible and near infrared region, respectively. By studying the spectra of some laser dyes, it was confirmed that the expected data were obtained by the constructed spectrophotometer.
The ability of our system is as follows ;
(1) Spectral wavelength region is from visible to near infrared (400nm-1800nm).
(2) Time resolution is -20ns.
(3) The spectrophotometer system is controlled and the experimental data are processed by a microcomputer.
By use of our near-infrared spectrophotometer system, absorption and fluorescence spectra, and fluorescence lifetimes of semiquinone radicals of xanthone, benzoylnaphthone, dibenzilidene acetone and flavone produced in poly (vinyl alcohol) films by gamma-irraidation. Fist several absorption bands and therefore the fluorescence bands of these radicals are in near-infrared region. The long wavelength location is the reason why the fluorescence spectra of these radicals have not been measured until very recently.
We succeeded in measuring the fluorescence spectra of these radicals for the first time. It was also found that the fluorescence lifetimes of these radicals are shorter than the pulse width of laser excitation laser (8ns).

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report

URL: 

Published: 1989-04-01   Modified: 2016-04-21  

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