Time-resolved detection of reaction products in the infrared laser chemistry of sulfoxides:C2H4SO, (CH3)2SO, (CD3)2SO

Heike Gross*, Yabai He, Martin Quack, Alex Schmid, Georg Seyfang

*Corresponding author for this work

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The first observations of the infrared laser chemical reaction of organic sulfoxides after IR multiphoton excitation of the SO infrared chromophore (with large band strength G=2.0 pm2 in (CH3)2SO) with pulsed CO2 laser radiation are reported. The collisionless IR photochemical primary products are shown to be C2H4 and SO (3Σ-) for C2 H4SO, and CH3 and (3Σ-) SO (via CH3SO) for (CH3)2SO by means of time-resolved laser spectroscopic observation of C2H4, SO, and CD3. Effective laser chemical rate constants kI(st)=1.2 cm2 J-1 for C2H4SO (9R32) and 0.06 cm2 J-1 for (CH3)2SO (9R32) are obtained from static yield measurements as well as unimolecular decay constants k≈107 to 108 s-1 (for C2H4SO) after excitation above threshold and laser probing of C2H4 and SO. A nonlinear intensity dependence of k(st) is reported for C2H4SO and nanosecond intramolecular relaxation for (CH3)2SO.

Original languageEnglish
Pages (from-to)122-130
Number of pages9
JournalChemical Physics Letters
Volume213
Issue number1-2
DOIs
Publication statusPublished - 1 Oct 1993
Externally publishedYes

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