Issue 7, 2018

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

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

Article information

Article type
Communication
Submitted
27 Apr. 2018
Accepted
17 Maijs 2018
First published
18 Maijs 2018

J. Anal. At. Spectrom., 2018,33, 1150-1153

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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