The sensitive detection of NO by Faraday modulation spectroscopy with a quantum cascade laser

被引:58
作者
Ganser, H
Urban, W
Brown, AM
机构
[1] Phys & Theoret Chem Lab, Oxford OX1 3QZ, England
[2] Inst Angew Phys, D-53115 Bonn, Germany
关键词
The experimental programme was supported by the Deutsche Forschungsgemeinschaft through SFB 334 at the University of Bonn. We are very grateful to Dr. Federico Capasso and Dr. Claire Gmachl at Bell Labs; Lucent Technologies; Murray Hill; for providing a QCL sample for our test experiments. J.M.B. thanks the Alexander von Humboldt Foundation for a stay at the University of Bonn as an Awardee;
D O I
10.1080/00268970210159460
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
A spectrometer based on a quantum cascade laser and capable of operating at particular wavelengths in the mid-infrared with very high sensitivity for the detection of open-shell molecules has been developed. It exploits magnetic field modulation in the Faraday rotation configuration. The signals for nitric oxide (NO) that may be observed with this instrument have been studied and their dependence on the J and Omega quantum numbers investigated with a simulation program. It is shown that the Q(3/2) transition of NO in the (2)Pi(3/2) component at 1875.8 cm(-1) would provide the greatest sensitivity for detection. The experimental observation of the R(21/2) transition of the Omega = 1/2 component gives a detection limit of 41 ppb of NO in air at a pressure of 25 mbar. Detection of NO through the Q(3/2) transition would provide a detection limit of 4 ppb at this pressure.
引用
收藏
页码:545 / 550
页数:6
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