羰基硫三聚体的红外光谱。

Infrared spectra of the OCS trimer.

作者信息

Afshari Mahin, Dehghani M, Abusara Z, Moazzen-Ahmadi N, McKellar A R W

机构信息

Department of Physics and Astronomy, University of Calgary, 2500 University Drive North West, Calgary, Alberta, Canada.

出版信息

J Chem Phys. 2007 Oct 14;127(14):144310. doi: 10.1063/1.2793782.

DOI:10.1063/1.2793782

PMID:17935398

Abstract

Infrared spectra of the barrel-shaped trimer (OCS)(3), previously known from its microwave spectrum, are reported for the first time. The observations are carried out in a supersonic slit-jet expansion of a He+OCS gas mixture which is probed with a tunable diode laser. Three rotationally resolved bands associated with the nu(1) fundamental vibration of OCS (2062.20 cm(-1)) are observed, at about 2047, 2053, and 2077 cm(-1). Small perturbations are noted in the 2077 cm(-1) band and may also be present in the 2053 cm(-1) band, which is weak and hence more difficult to analyze precisely. Employing a variety of evidence, we suggest a plausible assignment for the nature of the OCS vibrations in each of the three bands.

摘要

首次报道了桶状三聚体(OCS)₃的红外光谱，此前已通过其微波光谱得知该三聚体。观测是在He + OCS气体混合物的超声速狭缝射流膨胀中进行的，用可调谐二极管激光器进行探测。观测到与OCS的ν₁基频振动(2062.20 cm⁻¹)相关的三个转动分辨带，分别位于约2047、2053和2077 cm⁻¹处。在2077 cm⁻¹带中发现了小的微扰，2053 cm⁻¹带中可能也存在微扰，该带较弱，因此更难精确分析。利用各种证据，我们对三个带中每个带的OCS振动性质提出了一个合理的归属。