用于脉冲超声速射流的可调谐二极管激光光谱仪：应用于弱束缚复合物和团簇

Tunable diode laser spectrometer for pulsed supersonic jets: application to weakly-bound complexes and clusters.

作者信息

Brookes Matthew D, Xia Changhong, Tang Jian, Anstey James A, Fulsom Bryan G, Au Yong Ke-Xian, King Jenna M, McKellar A R W

机构信息

Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa Ont., Canada K1A 0R6.

出版信息

Spectrochim Acta A Mol Biomol Spectrosc. 2004 Dec;60(14):3235-42. doi: 10.1016/j.saa.2003.11.041.

DOI:10.1016/j.saa.2003.11.041

PMID:15561604

Abstract

The design and operation of an apparatus for studying infrared spectra of weakly-bound complexes is described in detail. A pulsed supersonic jet expansion is probed using a tunable Pb-salt diode laser spectrometer operated in a rapid-scan mode. The jet may be fitted with either pinhole or slit shaped nozzles, the former giving lower effective rotational temperatures, and the latter giving sharper spectral lines. Notable features of the apparatus include use of a toroidal multi-pass mirror system to give over 100 passes of the laser through the supersonic jet, use of the normal laser controller for laser sweeping during both setup and data acquisition, and use of a simple semi-automated wavenumber calibration procedure. Performance of the apparatus is illustrated with observed spectra of the van der Waals complex He-OCS, and the seeded helium clusters He(N)-OCS and He(N)-CO.

摘要

详细描述了一种用于研究弱束缚复合物红外光谱的仪器的设计与操作。使用在快速扫描模式下运行的可调谐铅盐二极管激光光谱仪探测脉冲超声速射流膨胀。射流可配备针孔或狭缝形喷嘴，前者产生较低的有效转动温度，后者产生更尖锐的谱线。该仪器的显著特点包括使用环形多程镜系统使激光在超声速射流中通过100多次，在设置和数据采集期间使用普通激光控制器进行激光扫描，以及使用简单的半自动波数校准程序。通过范德华复合物He-OCS以及种子氦团簇He(N)-OCS和He(N)-CO的观测光谱展示了该仪器的性能。