Temperature Difference Between Gas Species in Absorption Measurements Using Diode Laser Absorption Spectroscopy and Its Effect on Temperature Reduction
Temperature Difference Between Gas Species in Absorption Measurements Using Diode Laser Absorption Spectroscopy and Its Effect on Temperature Reduction
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DOI：
10.46770/as.2021.006
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发表时间：
2021-05-01
影响因子：
3.4
通讯作者：
Matsui, Makoto
中科院分区：
文献类型：
--
作者：
Kuwahara, Akira;Aiba, Yasuaki;Matsui, Makoto
半导体激光吸收光谱法（DLAS）是一种有效的放射性核素同位素分析方法。用于检测轻微位移的光谱分辨率也可以通过使用绝热膨胀的温度降低来增强。在我们以前的研究中，我们报告说，平移温度成功地降低到约180 K的氙同位素分析使用超音速等离子体射流。然而，与超音速等离子体射流边缘处的氩原子温度（790 K）相比，关于显著的温度降低仍然存在相当大的不确定性。在这项研究中，两个物种的三种混合气体模式（氖/氩，氩/锶，氩/氙）之间的温度差进行了研究，使用低压辉光放电等离子体。混合气体模式的温度差异被清楚地观察到，是足够的证据来支持我们以前的结果。讨论了温度差与作为吸收跃迁的低能态能级之间的关系。
The observation of isotope shifts due to a difference in mass number by diode laser absorption spectroscopy (DLAS) is a powerful approach for the isotope analysis of radionuclides. The spectral resolution for the detection of slight shifts can also be enhanced by a temperature reduction using adiabatic expansion. In our previous studies, we reported that the translational temperature was successfully decreased to approximately 180 K in xenon isotope analysis using a supersonic plasma jet. However, there remains a considerable uncertainty regarding the significant temperature reduction compared with the temperature of argon atoms at the edge of the supersonic plasma jet, which is at 790 K. In this study, temperature differences between two species of three mixed gas patterns (neon/argon, argon/strontium, and argon/xenon) were investigated using low-pressure glow discharge plasma. The temperature differences for the mixed gas patterns were clearly observed and are sufficient evidence to support our previous results. The relationship between temperature differences and energy levels of lower states used as absorption transitions is also discussed.