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Differential Raman cross section of dimethyl sulfide
Author(s) -
Barletta Robert E.,
Roe Christopher H.
Publication year - 2011
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2749
Subject(s) - raman spectroscopy , sulfur , chemistry , hydrogen sulfide , analytical chemistry (journal) , excitation , dimethyl sulfide , excitation wavelength , carbon fibers , wavelength , laser , hydrogen , sulfide , resonance (particle physics) , materials science , optics , atomic physics , chromatography , optoelectronics , organic chemistry , physics , electrical engineering , composite number , engineering , composite material
Biogenic sulfur compounds such as dimethyl sulfide (DMS) are important contributors to the global carbon cycle. The differential Raman cross section of DMS relative to the nitrogen fundamental, σ DMS , has been measured at several excitation wavelengths in order to assess the applicability of Raman spectroscopy for the direct quantitative measurement of this compound. At 488 nm, σ DMS for the ν 6 carbon–sulfur stretching mode was found to be 4.9 ± 1.6, while for the ν 2 carbon–hydrogen stretching mode it was 2.8 ± 0.9. Using, KrF laser excitation, values for σ DMS could be measured simultaneously at two excitation wavelengths, 248.32 and 248.69 nm. The average values of σ DMS for 248‐nm excitation based on measurements at these two excitation wavelengths were 3.5 ± 1.4 for the carbon–sulfur stretching mode and 4.6 ± 0.6 for the carbon–hydrogen stretching mode. The results indicate that no significant resonance enhancement of σ DMS for either mode occurs, although they show some slight enhancement of the cross section for the ν 2 band (CH stretching mode). It was concluded that the measured values of σ DMS are high enough to allow the quantitative detection of DMS at the millimolar level. Copyright © 2010 John Wiley & Sons, Ltd.