Optics and Precision Engineering, Volume. 22, Issue 10, 2617(2014)
Cryogenic cell for low-temperature spectral experiments of atmospheric molecules
A new controllable cryogenic cell is designed to provide very useful low temperature spectroscopic parameters for a laser atmospheric transmission project and trace gas detection. On the basis of the existing low temperature cryogenic cell, the new developed cryogenic cell improves the installation of a dewar and a sample cell, cell sample materials and concrete cooling method, and increases temperature stability and uniformity of the cell. The experimental results indicate that the new cryogenic cell shows its temperature fluctuations to be less than ±0.3 K in monitoring time of 0.5 h and the temperature gradient to be about 0.03 K/cm. Based on the developed cryogenic cell, the low temperature spectroscopy of carbon dioxide at 6 358.654 cm-1 is measured by using tunable diode laser absorption spectroscopy and the self-broadening coefficient and the temperature-dependent exponent (n=0.738±0.014) of the carbon dioxide absorption spectrum are obtained. The results show that the temperature-dependent exponent is in good agreement with that other reports. In conclusion, the cell is able to fulfill the requirements of low temperature absorption spectral experiments of atmospheric molecules.
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MA Hong-liang, SUN Ming-guo, CAO Zhen-song, HUANG Yin-bo, WANG Gui-shi, GAO Xiao-ming, RAO Rui-zhong. Cryogenic cell for low-temperature spectral experiments of atmospheric molecules[J]. Optics and Precision Engineering, 2014, 22(10): 2617
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Received: Oct. 22, 2013
Accepted: --
Published Online: Nov. 6, 2014
The Author Email: Hong-liang MA (hlgnma@foxmail.com)