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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Thermal lens spectroscopy in cryogenic solutions: Analysis and comparison of intensities in CH4-N-2 and CH4-Ar liquid solutions
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Thermal lens spectroscopy in cryogenic solutions: Analysis and comparison of intensities in CH4-N-2 and CH4-Ar liquid solutions

机译：低温溶液中的热透镜光谱：分析和比较CH4-N-2和CH4-Ar液体溶液中的强度

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摘要

The C-H (Delta nu = 6) absorption spectrum of methane has been obtained in liquid nitrogen and argon solutions using thermal lens spectroscopy. Mathematical models for continuous and periodic excitation were used to describe the concentration dependence of thermal lens intensities. Better fitting of the experimental results was accomplished by taking into account the periodic nature of the excitation. Comparison of thermal lens intensities in nitrogen and argon allowed calculation of relative enhancement factors. In dilute solutions, the intensity in liquid nitrogen was 1.39 +/- 0.08 times higher than that in argon. The literature estimation of this ratio is 1.49 +/- 0.61. In contrast to the estimated value, our result confidently shows actual variation in enhancement factors. This article not only shows the applicability of thermal lensing to cryosamples but also demonstrates that accurate measurements at low temperature are possible.
机译：使用热透镜光谱法已在液氮和氩溶液中获得了甲烷的C-H（Delta nu = 6）吸收光谱。使用连续和周期性激发的数学模型来描述热透镜强度的浓度依赖性。考虑到激励的周期性，可以更好地拟合实验结果。比较氮气和氩气中热透镜的强度，可以计算出相对增强因子。在稀溶液中，液氮的强度是氩气强度的1.39 +/- 0.08倍。该比率的文献估计为1.49 +/- 0.61。与估计值相反，我们的结果自信地显示出增强因子的实际变化。本文不仅展示了热透镜在低温样品上的适用性，还证明了在低温下进行精确测量是可能的。

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