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Time-Resolved Raman Spectroscopy of Hexafluorobenzene (C6F6) under Laser-Driven Shock Compression

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Time-Resolved Raman Spectroscopy of Hexafluorobenzene (C6F6) under Laser-Driven Shock Compression. / Mohan, Ashutosh; Chaurasia, S.; Rao, Usha; Pasley, John Richard.

In: Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 263, 107547, 01.02.2021.

Research output: Contribution to journalArticlepeer-review

Harvard

Mohan, A, Chaurasia, S, Rao, U & Pasley, JR 2021, 'Time-Resolved Raman Spectroscopy of Hexafluorobenzene (C6F6) under Laser-Driven Shock Compression', Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 263, 107547. https://doi.org/10.1016/j.jqsrt.2021.107547

APA

Mohan, A., Chaurasia, S., Rao, U., & Pasley, J. R. (2021). Time-Resolved Raman Spectroscopy of Hexafluorobenzene (C6F6) under Laser-Driven Shock Compression. Journal of Quantitative Spectroscopy and Radiative Transfer, 263, [107547]. https://doi.org/10.1016/j.jqsrt.2021.107547

Vancouver

Mohan A, Chaurasia S, Rao U, Pasley JR. Time-Resolved Raman Spectroscopy of Hexafluorobenzene (C6F6) under Laser-Driven Shock Compression. Journal of Quantitative Spectroscopy and Radiative Transfer. 2021 Feb 1;263. 107547. https://doi.org/10.1016/j.jqsrt.2021.107547

Author

Mohan, Ashutosh ; Chaurasia, S. ; Rao, Usha ; Pasley, John Richard. / Time-Resolved Raman Spectroscopy of Hexafluorobenzene (C6F6) under Laser-Driven Shock Compression. In: Journal of Quantitative Spectroscopy and Radiative Transfer. 2021 ; Vol. 263.

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@article{b2dcb6d7951b4c69a80501797c35fe39,
title = "Time-Resolved Raman Spectroscopy of Hexafluorobenzene (C6F6) under Laser-Driven Shock Compression",
abstract = "Hexafluorobenzene is used as a cooling fluid in nuclear reactors, production of pharmaceutical compounds and in prognostic biomarkers. It is useful to understand the dynamics of Hexafluorobenzene under extreme conditions. For the first time, we have performed Time-resolved Raman Spectroscopy of laser shocked Hexafluorobenzene using a pump-probe technique to study the effect of high pressure at the molecular level and possible phase transitions. A 2 J / 8 ns Nd: YAG laser system is used for generating shock pressures of up to 4.5 GPa in the sample in a confined geometry. Three prominent modes at 370 cm -1 (e 1g fundamental mode or ν 10 ), 445 cm -1 (e 2g fundamental mode or ν 6 ) and 560 cm -1 (a 1g fundamental mode or ν 1 ) exhibit blue shift with scaling factors of 370 + 0.88 P(GPa), 445 +1.22P(GPa) and 560 +1.93P(GPa) respectively. A liquid→Phase-II phase transition is observed at a pressure of 0.9 GPa which is very close to the 0.8 GPa pressure at which a phase transition has been reported to occur under static compression. The shock velocity in Hexafluorobenzene at a laser energy of 300 mJ and 500 mJ is calculated by measuring the intensity ratio of Raman modes emerging from the shocked region to that of the whole sample. To validate the experimental results, 1-D radiation hydrodynamics simulations are also performed. Experimentally obtained shock velocities, at a laser intensity of 1.47 GW/cm 2 (300 mJ) and 2.46 GW/cm 2 (500 mJ), are 2.54 km/s and 3.65 km/s respectively which are in close agreement with simulation results of 2.98 km/s and 3.84 km/s respectively. Gruneisen parameters corresponding to the three modes are also calculated which are 0.00950 ±0.0140 (ν 10 mode), 0.0433 ± 0.0060 (ν 6 mode), and 0.0561 ± 0.0044 (ν 1 mode) respectively.",
author = "Ashutosh Mohan and S. Chaurasia and Usha Rao and Pasley, {John Richard}",
note = "{\textcopyright} 2021 Elsevier Ltd. All rights reserved. This is an author-produced version of the published paper. Uploaded in accordance with the publisher{\textquoteright}s self-archiving policy. ",
year = "2021",
month = feb,
day = "1",
doi = "10.1016/j.jqsrt.2021.107547",
language = "English",
volume = "263",
journal = "Journal of Quantitative Spectroscopy and Radiative Transfer",
issn = "0022-4073",
publisher = "Elsevier",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Time-Resolved Raman Spectroscopy of Hexafluorobenzene (C6F6) under Laser-Driven Shock Compression

AU - Mohan, Ashutosh

AU - Chaurasia, S.

AU - Rao, Usha

AU - Pasley, John Richard

N1 - © 2021 Elsevier Ltd. All rights reserved. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy.

PY - 2021/2/1

Y1 - 2021/2/1

N2 - Hexafluorobenzene is used as a cooling fluid in nuclear reactors, production of pharmaceutical compounds and in prognostic biomarkers. It is useful to understand the dynamics of Hexafluorobenzene under extreme conditions. For the first time, we have performed Time-resolved Raman Spectroscopy of laser shocked Hexafluorobenzene using a pump-probe technique to study the effect of high pressure at the molecular level and possible phase transitions. A 2 J / 8 ns Nd: YAG laser system is used for generating shock pressures of up to 4.5 GPa in the sample in a confined geometry. Three prominent modes at 370 cm -1 (e 1g fundamental mode or ν 10 ), 445 cm -1 (e 2g fundamental mode or ν 6 ) and 560 cm -1 (a 1g fundamental mode or ν 1 ) exhibit blue shift with scaling factors of 370 + 0.88 P(GPa), 445 +1.22P(GPa) and 560 +1.93P(GPa) respectively. A liquid→Phase-II phase transition is observed at a pressure of 0.9 GPa which is very close to the 0.8 GPa pressure at which a phase transition has been reported to occur under static compression. The shock velocity in Hexafluorobenzene at a laser energy of 300 mJ and 500 mJ is calculated by measuring the intensity ratio of Raman modes emerging from the shocked region to that of the whole sample. To validate the experimental results, 1-D radiation hydrodynamics simulations are also performed. Experimentally obtained shock velocities, at a laser intensity of 1.47 GW/cm 2 (300 mJ) and 2.46 GW/cm 2 (500 mJ), are 2.54 km/s and 3.65 km/s respectively which are in close agreement with simulation results of 2.98 km/s and 3.84 km/s respectively. Gruneisen parameters corresponding to the three modes are also calculated which are 0.00950 ±0.0140 (ν 10 mode), 0.0433 ± 0.0060 (ν 6 mode), and 0.0561 ± 0.0044 (ν 1 mode) respectively.

AB - Hexafluorobenzene is used as a cooling fluid in nuclear reactors, production of pharmaceutical compounds and in prognostic biomarkers. It is useful to understand the dynamics of Hexafluorobenzene under extreme conditions. For the first time, we have performed Time-resolved Raman Spectroscopy of laser shocked Hexafluorobenzene using a pump-probe technique to study the effect of high pressure at the molecular level and possible phase transitions. A 2 J / 8 ns Nd: YAG laser system is used for generating shock pressures of up to 4.5 GPa in the sample in a confined geometry. Three prominent modes at 370 cm -1 (e 1g fundamental mode or ν 10 ), 445 cm -1 (e 2g fundamental mode or ν 6 ) and 560 cm -1 (a 1g fundamental mode or ν 1 ) exhibit blue shift with scaling factors of 370 + 0.88 P(GPa), 445 +1.22P(GPa) and 560 +1.93P(GPa) respectively. A liquid→Phase-II phase transition is observed at a pressure of 0.9 GPa which is very close to the 0.8 GPa pressure at which a phase transition has been reported to occur under static compression. The shock velocity in Hexafluorobenzene at a laser energy of 300 mJ and 500 mJ is calculated by measuring the intensity ratio of Raman modes emerging from the shocked region to that of the whole sample. To validate the experimental results, 1-D radiation hydrodynamics simulations are also performed. Experimentally obtained shock velocities, at a laser intensity of 1.47 GW/cm 2 (300 mJ) and 2.46 GW/cm 2 (500 mJ), are 2.54 km/s and 3.65 km/s respectively which are in close agreement with simulation results of 2.98 km/s and 3.84 km/s respectively. Gruneisen parameters corresponding to the three modes are also calculated which are 0.00950 ±0.0140 (ν 10 mode), 0.0433 ± 0.0060 (ν 6 mode), and 0.0561 ± 0.0044 (ν 1 mode) respectively.

U2 - 10.1016/j.jqsrt.2021.107547

DO - 10.1016/j.jqsrt.2021.107547

M3 - Article

VL - 263

JO - Journal of Quantitative Spectroscopy and Radiative Transfer

JF - Journal of Quantitative Spectroscopy and Radiative Transfer

SN - 0022-4073

M1 - 107547

ER -