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Mid-Infrared Time-Resolved Frequency Comb Spectroscopy of Transient Free Radicals.
Fleisher, Adam J; Bjork, Bryce J; Bui, Thinh Q; Cossel, Kevin C; Okumura, Mitchio; Ye, Jun.
Affiliation
  • Fleisher AJ; †JILA, National Institute of Standards and Technology and University of Colorado, Department of Physics, 440 UCB, Boulder, Colorado 80309, United States.
  • Bjork BJ; ‡Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States.
  • Bui TQ; †JILA, National Institute of Standards and Technology and University of Colorado, Department of Physics, 440 UCB, Boulder, Colorado 80309, United States.
  • Cossel KC; §Arthur Amos Noyes Laboratory of Chemical Physics, Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, United States.
  • Okumura M; †JILA, National Institute of Standards and Technology and University of Colorado, Department of Physics, 440 UCB, Boulder, Colorado 80309, United States.
  • Ye J; §Arthur Amos Noyes Laboratory of Chemical Physics, Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, United States.
J Phys Chem Lett ; 5(13): 2241-6, 2014 Jul 03.
Article in En | MEDLINE | ID: mdl-26279541
ABSTRACT
We demonstrate time-resolved frequency comb spectroscopy (TRFCS), a new broadband absorption spectroscopy technique for the study of trace free radicals on the microsecond timescale. We apply TRFCS to study the time-resolved, mid-infrared absorption of the deuterated hydroxyformyl radical trans-DOCO, an important short-lived intermediate along the OD + CO reaction path. Directly after photolysis of the chemical precursor acrylic acid-d1, we measure absolute trans-DOCO product concentrations with a sensitivity of 5 × 10(10) cm(-3) and observe its subsequent loss with a time resolution of 25 µs. The multiplexed nature of TRFCS allows us to detect simultaneously the time-dependent concentration of several other photoproducts and thus unravel primary and secondary chemical reaction pathways.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: J Phys Chem Lett Year: 2014 Document type: Article Affiliation country: United States
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: J Phys Chem Lett Year: 2014 Document type: Article Affiliation country: United States