Journal
OPTICA
Volume 4, Issue 5, Pages 563-570Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPTICA.4.000563
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Funding
- National Science Foundation (NSF) [CBET-1645542]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1645542] Funding Source: National Science Foundation
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The study of internal molecular energy transfer is important for a variety of nonequilibrium and nonthermal environments, including plasma-based manufacturing and materials treatment, medical device treatment applications, and plasma-assisted combustion. In the current work, hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering spectroscopy is demonstrated for simultaneous, single-shot measurement of pure-rotational and rovibrational energy distributions in the highly nonequilibrium environment of a dielectric barrier discharge plasma. Detailed spatial distributions and shot-to-shot fluctuations of rotational temperatures spanning 325-450 K and corresponding vibrational temperatures of 1200-5000 K are recorded across the plasma and surrounding flow with high precision and accuracy. This approach allows concise measurements of vibrational/rotational energy distributions in nonequilibrium environments at kilohertz rates that are free of nonresonant background and minimize interference from molecular collisions. (C) 2017 Optical Society of America
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