Optical properties of high-pressure fluid hydrogen across molecular dissociation
Abstract
Optical properties of compressed fluid hydrogen in the region where dissociation and metallization is observed are computed by ab initio methods and compared with recent experimental results. We confirm that at T > 3,000 K, both processes are continuous, while at T < 1,500 K, the first-order phase transition is accompanied by a discontinuity of the dc conductivity and the thermal conductivity, while both the reflectivity and absorption coefficient vary rapidly but continuously. Our results support the recent analysis of National Ignition Facility (NIF) experiments [Celliers PM, et al. (2018) Science 361:677–682], which assigned the inception of metallization to pressures where the reflectivity is ~0.3. Furthermore, our results also support the conclusion that the temperature plateau seen in laser-heated diamond-anvil cell (DAC) experiments at temperatures higher than 1,500 K corresponds to the onset of optical absorption, not to the phase transition.
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1509943
- Alternate Identifier(s):
- OSTI ID: 1545367
- Grant/Contract Number:
- 2911; AC52-07NA27344; HyLightExtreme
- Resource Type:
- Published Article
- Journal Name:
- Proceedings of the National Academy of Sciences of the United States of America
- Additional Journal Information:
- Journal Name: Proceedings of the National Academy of Sciences of the United States of America; Journal ID: ISSN 0027-8424
- Publisher:
- National Academy of Sciences, Washington, DC (United States)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS; hydrogen; high pressure; metal insulator; optical properties; quantum Monte Carlo
Citation Formats
Rillo, Giovanni, Morales, Miguel A., Ceperley, David M., and Pierleoni, Carlo. Optical properties of high-pressure fluid hydrogen across molecular dissociation. United States: N. p., 2019.
Web. doi:10.1073/pnas.1818897116.
Rillo, Giovanni, Morales, Miguel A., Ceperley, David M., & Pierleoni, Carlo. Optical properties of high-pressure fluid hydrogen across molecular dissociation. United States. https://doi.org/10.1073/pnas.1818897116
Rillo, Giovanni, Morales, Miguel A., Ceperley, David M., and Pierleoni, Carlo. Tue .
"Optical properties of high-pressure fluid hydrogen across molecular dissociation". United States. https://doi.org/10.1073/pnas.1818897116.
@article{osti_1509943,
title = {Optical properties of high-pressure fluid hydrogen across molecular dissociation},
author = {Rillo, Giovanni and Morales, Miguel A. and Ceperley, David M. and Pierleoni, Carlo},
abstractNote = {Optical properties of compressed fluid hydrogen in the region where dissociation and metallization is observed are computed by ab initio methods and compared with recent experimental results. We confirm that at T > 3,000 K, both processes are continuous, while at T < 1,500 K, the first-order phase transition is accompanied by a discontinuity of the dc conductivity and the thermal conductivity, while both the reflectivity and absorption coefficient vary rapidly but continuously. Our results support the recent analysis of National Ignition Facility (NIF) experiments [Celliers PM, et al. (2018) Science 361:677–682], which assigned the inception of metallization to pressures where the reflectivity is ~0.3. Furthermore, our results also support the conclusion that the temperature plateau seen in laser-heated diamond-anvil cell (DAC) experiments at temperatures higher than 1,500 K corresponds to the onset of optical absorption, not to the phase transition.},
doi = {10.1073/pnas.1818897116},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 30 00:00:00 EDT 2019},
month = {Tue Apr 30 00:00:00 EDT 2019}
}
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https://doi.org/10.1073/pnas.1818897116
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Cited by: 27 works
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