Detection of CISO with time-resolved Fourier-transform infrared absorption spectroscopy

摘要

ClSO was produced as an intermediate upon irradiating a flowing mixture of Cl_2SO and Ar with a KrF excimer laser at 248 nm.A step-scan Fourier-transform infrared spectrometer coupled with a small multiass absorption cell was employed to detect time-resolved absorption spectrum of ClSO.A transient spectrum in the region 1120-1200 cm~(-1),which diminished on prolonged reaction,is assigned to the S-O stretching (v_1) mode of ClSO.A spectrum with a resolution of 0.3 cm~(-1) partially reveals rotational structure with the Q-branch at 1162.9 cm~(-1).Calculations with density-functional theory (B3LYP/aug-cc-pVTZ) predict the geometry,vibrational,and rotational parameters of ClSO.An IR absorption spectrum of ClSO produced from phortolysis of Cl_2SO at 248 nm is internally hot.