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Issue 7, 2018
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High spectral resolution of diode laser absorption spectroscopy for isotope analysis using a supersonic plasma jet

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Abstract

Although high-temperature plasma sources have been used for direct isotope analysis of solid samples, the spectral resolution of diode laser absorption spectroscopy in high-temperature plasma is limited by the Doppler broadening of atomic absorption lines. Thus, a decrease in translational temperature is necessary to enhance the spectral resolution and distinguish isotope shifts due to the mass number. In this study, a supersonic plasma wind tunnel, also called an arc-jet plasma wind tunnel, was used to enhance the spectral resolution drastically, and a demonstration was carried out using natural stable xenon isotopes. As a result, the temperature was found to be about 180 K, and the spectral resolution was about one order of magnitude higher than that of the conventional high-temperature source. Additionally, the method proposed herein was verified by using two xenon isotopes.

Graphical abstract: High spectral resolution of diode laser absorption spectroscopy for isotope analysis using a supersonic plasma jet

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Publication details

The article was received on 27 Apr 2018, accepted on 17 May 2018 and first published on 18 May 2018


Article type: Communication
DOI: 10.1039/C8JA00120K
Citation: J. Anal. At. Spectrom., 2018,33, 1150-1153
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    High spectral resolution of diode laser absorption spectroscopy for isotope analysis using a supersonic plasma jet

    A. Kuwahara, Y. Aiba, S. Yamasaki, T. Nankawa and M. Matsui, J. Anal. At. Spectrom., 2018, 33, 1150
    DOI: 10.1039/C8JA00120K

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