Vibrational Spectrum of the Thiomethoxy (CH_3S) Radical Investigated with Infrared-Vacuum Ultraviolet Photoionization

Details Vibrational Spectrum of the Thiomethoxy (CH_3S) Radical Investigated with Infrared-Vacuum Ultraviolet Photoionization Vibrational Spectrum of the Thiomethoxy (CH_3S) Radical Investigated with Infrared-Vacuum Ultraviolet Photoionization

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mss..confewj12h&link_type=abstract

"International Symposium On Molecular Spectroscopy, 66th Meeting, Held 20-24 June, 2011 at Ohio State University. http://molspec

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Radicals And Ions

Scientific paper

We produced methylthio (or thiomethoxy, CH_3S) radicals by photodissociation of CH_3SH in a supersonic jet at 248 nm. The CH_3S+ ions were subsequently produced with the 1+1 IR-VUV photoionization and detected with the time-of-flight (TOF) technique. The IR spectrum of CH_3S was obtained on tuning the wavelength of the IR laser in the range 2780--3280 cm-1 while monitoring the intensity of the CH_3S+ signal; the frequency of the VUV laser was maintained at 134.8 nm, ~200 cm-1 below the ionization threshold of CH_3S (IE = 9.225 eV). This technique has an advantage over other IR-absorption techniques because its mass selectivity eliminates interferences from the precursor and other photolysis products such as H_2CS, CH_3, or CH_3SS. Absorption bands near 2820, 2904, and 3215 cm-1 were observed and tentatively assigned as transitions from the ground vibrational state to the 11, 41 (a_1), and 5162 states, respectively. These bands are in agreement with those reported for CH_3S produced via in situ photolysis of CH_3SH, CH_3SCH_3, and CH_3SSCH_3 isolated in solid p-H_2.[1] A new band near 2970 cm-1 that is consistent with that observed in photoelectron spectrum[2] might be assigned to the transition from the ground vibrational state to the a_1 component of the 5162 state.
M. Bahou and Y.-P. Lee, J. Chem. Phys. 133, 164316 (2010).
R. L. Schwartz, G. E. Davico, and W. C. Lineberger, J. electron Spectrosc. Relat. Phenom. 108, 163 (2000).

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