@article{5e489f0fd7814799a873d4aaf332546b,
title = "1-D imaging of rotation-vibration non-equilibrium from pure rotational ultrafast coherent anti-Stokes Raman scattering",
abstract = "We present one-dimensional (1-D) imaging of rotation-vibration non-equilibrium measured by two-beam pure rotational hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering (fs/ps CARS). Simultaneous measurements of the spatial distribution of molecular rotation-vibration non-equilibrium are critical for understanding molecular energy transfer in low temperature plasmas and hypersonic flows. However, non-equilibrium CARS thermometry until now was limited to point measurements. The red shift of rotational energy levels by vibrational excitation was used to determine the rotational and vibrational temperatures from 1-D images of the pure rotational spectrum. Vibrational temperatures up to 5500 K were detected in a CH4/N2 nanosecond-pulsed pin-to-pin plasma within 2 mm near the cathode. This approach enables study of non-equilibrium systems with 40 µm spatial resolution.",
author = "Chen, {Timothy Y.} and Goldberg, {Benjamin M.} and Patterson, {Brian D.} and Egemen Kolemen and Yiguang Ju and Kliewer, {Christopher J.}",
note = "Funding Information: Acknowledgment. This material is based upon work supported by the U.S. Department of Energy (DOE), Office of Science Graduate Student Research (SCGSR) program. The SCGSR program is administered by the Oak Ridge Institute for Science and Education for the DOE. CJK, BMG, and BDP were supported by the Office of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy. Sandia National Laboratories is a multi-mission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy{\textquoteright}s National Nuclear Security Administration. YJ would like to thank the funding support of DOE Plasma Science Center, NETL UCFER, and National Science Foundation grants. TYC was partially supported by the Program in Plasma Science and Technology Fellowship. TYC, EK, and YJ acknowledge the support of ExxonMobil through its membership in the Princeton E-filliates Partnership of the Andlinger Center for Energy and the Environment. The authors thank Dr. Benjamin T. Yee for lending a high voltage switch for these experiments. Publisher Copyright: {\textcopyright} 2020 Optical Society of America",
year = "2020",
month = aug,
day = "1",
doi = "10.1364/OL.394122",
language = "English (US)",
volume = "45",
pages = "4252--4255",
journal = "Optics Letters",
issn = "0146-9592",
publisher = "The Optical Society",
number = "15",
}