Spectroscopic studies of small radicals (CH3S)

Yuan-Pern Lee

doi:10.1117/12.143113

22 April 1993 Spectroscopic studies of small radicals (CH3S)

Yuan-Pern Lee

Proceedings Volume 1858, Laser Techniques for State-Selected and State-to-State Chemistry; (1993) https://doi.org/10.1117/12.143113
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

The CH3SO radical was formed from reaction of dimethyl disulfide (CH-3)SSCH3 with microwave-discharged O2) in a flow tube. The A²A' IMP X²A" fluorescence excitation spectrum was observed in the wavelength region 615 - 692 nm. The origin was located at 14,542 cm^-1; the vibrational frequency for the SO stretching of the A state was 859 cm^-1. Dispersed fluorescence was observed in the 680 - 850 nm region. The main progressions gave vibrational frequencies of 1066 cm^-1(nu)5", SO stretching), 704 cm^-1 ((nu) 7)", CS stretching), and 1464 cm^-1 ((nu) 4)", CH3-deformation). The results agree with ab initio calculations. Infrared absorption lines of the CH3)S radical were observed after UV photolysis of a CH3)SH/Ar (1/500) matrix at 12 K. The results yielded (nu) 1) (CH stretching) equals 2948.6, (nu) 2) (CH3)-umbrella) equals 1315.1, ((nu) 3) (CS stretching) equals 719.4, (nu) 4) approximately equals 2873, and 2(nu) 6) (CH3) rocking) equals 1154 cm^-1.

Citation Download Citation

Yuan-Pern Lee "Spectroscopic studies of small radicals (CH3S)", Proc. SPIE 1858, Laser Techniques for State-Selected and State-to-State Chemistry, (22 April 1993); https://doi.org/10.1117/12.143113

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