science-softCon uv/vis+ photochemistry database;	www.photochemistry.org; (C) science-softCon 2019

Substance: methanethiol					Other Names: methyl mercaptan

Formula: CH3SH						CAS-No.: 74-93-1

Study: quantum yields, photolysis, absorption cross sections


Authors: S.B. Barone, A.A. Turnipseed, T. Gierczak, A.R. Ravishankara

Title: Quantum yields of H(2S) and CH3S(2E) from the photolysis of simple organosulfur compounds at 193, 222, and 248 nm

Journal/Source: J. Phys. Chem., 98 (46), 11969-11977, (1994); DOI: 10.1021/j100097a024


Data: 

Energy/Wavelength range: 184.9 nm;193.0 nm

Resolution: 

Temperature: 298 K

Temperature dependence: no

Pressure/Concentration: 

Phase:

pH:


Comments: The primary quantum yields for the formation of H(S-2), Phi(H), and CH3S((2)E), Phi(CH3S), in the photodissociation of 
methyl mercaptan, dimethyl sulfide (DMS), and dimethyl disulfide (DMDS) at 193, 222, and 248 nm were measured.
Phi(H) were measured using resonance fluorescence detection of H atoms. The Phi(H) were 0.55 +/- 0.04 at 193 nm, 0.98 +/- 0.15 
at 222 nm, and 1.09 +/- 0.25 at 248 nm for methyl mercaptan; <0.02 at 222 nm and <0.03 at 193 nm for DMS; and <0.06 at 222 nm 
and <0.08 at 193 nm for DMDS. No H atom production was observed in the 248 nm photolysis of DMS and DMDS.
The Phi(CH3S), measured by CH3S detection via pulsed laser-induced fluorescence, were 0.93 +/- 0.21 at 248 nn and 0.78 +/- 0.10 
at 193 nm for DMS; 1.65 +/- 0.38 at 248 nm and 1.20 +/- 0.14 at 193 nm for DMDS; and 0.48 +/- 0.10 at 193 nm for methyl mercaptan.
The absorption cross sections at 184.9 nm and 193.0 nm are presented.

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