Cavity ring down spectroscopy with 5 x 10-13 cm-1 sensitivity

被引：152

作者：

Kassi, Samir ^{[1
]}

Campargue, Alain ^{[1
]}

机构：

[1] Univ Grenoble 1, Lab Interdisciplinaire Phys, CNRS UMR 5588, F-38402 St Martin Dheres, France

来源：

JOURNAL OF CHEMICAL PHYSICS | 2012年 / 137卷 / 23期

关键词：

infrared spectra; nitrogen; photodetectors; quadrupole moments;

D O I：

10.1063/1.4769974

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The ultimate sensitivity performances obtained with a continuous wave-cavity ring down spectroscopy setup in the near infrared are investigated. At fixed frequency, the noise of the photodetector is found to be the main limitation and the best limit of detection (about 10(-11) cm(-1)) is reached after a 10 s averaging. We show that long term baseline fluctuations can be efficiently averaged over several days allowing us to reach a detection limit as low as 5 x 10(-1)3 cm(-1). The achieved sensitivity is illustrated on narrow spectral intervals where the weakest lines detected so far by absorption spectroscopy are observed: (i) ultra-weak transitions of the a(1)Delta(g)(0)-X (3)Sigma(-)(g)(1) hot band of O-16(2) near 1.58 mu m and (ii) first detection of an electric quadrupole transition in the second overtone band of nitrogen (N-14(2)) near 1.44 mu m. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4769974]

引用

页数：6

共 21 条

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