硫氧化碳-二氧化碳“新”异构体的傅里叶变换微波光谱

Fourier transform microwave spectra of a "new" isomer of OCS-CO2.

作者信息

Sedo Galen, van Wijngaarden Jennifer

机构信息

Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.

出版信息

J Chem Phys. 2009 Jul 28;131(4):044303. doi: 10.1063/1.3186756.

DOI:10.1063/1.3186756

PMID:19655863

Abstract

The rotational spectrum of a "new" isomer of OCS-CO(2) has been measured between 5 and 18 GHz using Fourier transform microwave spectroscopy. Both a- and b-type transitions of the parent dimer and the (13)CO(2)-containing isotopologue were fit and the resulting spectroscopic constants confirm that this is the planar O-interior, not-quite-as-parallel isomer that was experimentally observed for the first time in the recent infrared investigation of Dehghany et al. [J. Chem. Phys. 130, 224310 (2009)]. As in the infrared study, the microwave transitions of this isomer appear stronger than those of the previously reported lower energy isomer of OCS-CO(2) when helium is used as the backing gas for the supersonic expansion.

摘要

利用傅里叶变换微波光谱法，在5至18吉赫兹之间测量了OCS-CO₂“新”异构体的转动光谱。对母体二聚体及其含¹³CO₂的同位素异构体的a型和b型跃迁进行了拟合，所得光谱常数证实这是平面O内型、不太平行的异构体，这是在Dehghany等人最近的红外研究中首次通过实验观察到的[《化学物理杂志》130, 224310 (2009)]。与红外研究一样，当使用氦气作为超声速膨胀的背景气体时，该异构体的微波跃迁似乎比先前报道的OCS-CO₂低能量异构体的跃迁更强。