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Title: Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet

Abstract

Ultrafast time-resolved extreme ultraviolet (EUV) reflectivity measurements of optically pumped amorphous carbon (a-C) have been performed with the FERMI free electron laser (FEL). This work extends the energy range used in previous reflectivity studies and adds polarization dependence. The EUV probe is known to be sensitive to lattice dynamics, since in this range the reflectivity is essentially unaffected by the photo-excited surface plasma. The exploitation of both s- and p-polarized EUV radiation permits variation of the penetration depth of the probe; a significant increase in the characteristic time is observed upon increasing the probing depth (1 vs. 5 ps) due to hydrodynamic expansion and consequent destruction of the excited region, implying that there is only a short window during which the probed region is in the isochoric regime. A weak wavelength dependence of the reflectivity is found, consistent with previous measurements and implying a maximum electronic temperature of 0.8 eV ± 0.4.

Authors:
ORCiD logo; ; ; ; ; ; ; ; ; ORCiD logo; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; US Army Research Laboratory (USARL); US Army Research Office (ARO); National Science Foundation (NSF)
OSTI Identifier:
1630681
Alternate Identifier(s):
OSTI ID: 1695729
Grant/Contract Number:  
AC02-05CH11231; DGE 1106400; W911NF-13-1-0483; W911NF-17-1-0163
Resource Type:
Published Article
Journal Name:
Photonics
Additional Journal Information:
Journal Name: Photonics Journal Volume: 7 Journal Issue: 2; Journal ID: ISSN 2304-6732
Publisher:
MDPI
Country of Publication:
Switzerland
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; liquid carbon; EUV; free electron laser; reflectivity; pump-probe; polarization

Citation Formats

Raj, Sumana, Devlin, Shane, Mincigrucci, Riccardo, Schwartz, Craig, Principi, Emiliano, Bencivenga, Filippo, Foglia, Laura, Gessini, Alessandro, Simoncig, Alberto, Kurdi, Gabor, Masciovecchio, Claudio, and Saykally, Richard. Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet. Switzerland: N. p., 2020. Web. doi:10.3390/photonics7020035.
Raj, Sumana, Devlin, Shane, Mincigrucci, Riccardo, Schwartz, Craig, Principi, Emiliano, Bencivenga, Filippo, Foglia, Laura, Gessini, Alessandro, Simoncig, Alberto, Kurdi, Gabor, Masciovecchio, Claudio, & Saykally, Richard. Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet. Switzerland. doi:https://doi.org/10.3390/photonics7020035
Raj, Sumana, Devlin, Shane, Mincigrucci, Riccardo, Schwartz, Craig, Principi, Emiliano, Bencivenga, Filippo, Foglia, Laura, Gessini, Alessandro, Simoncig, Alberto, Kurdi, Gabor, Masciovecchio, Claudio, and Saykally, Richard. Sat . "Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet". Switzerland. doi:https://doi.org/10.3390/photonics7020035.
@article{osti_1630681,
title = {Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet},
author = {Raj, Sumana and Devlin, Shane and Mincigrucci, Riccardo and Schwartz, Craig and Principi, Emiliano and Bencivenga, Filippo and Foglia, Laura and Gessini, Alessandro and Simoncig, Alberto and Kurdi, Gabor and Masciovecchio, Claudio and Saykally, Richard},
abstractNote = {Ultrafast time-resolved extreme ultraviolet (EUV) reflectivity measurements of optically pumped amorphous carbon (a-C) have been performed with the FERMI free electron laser (FEL). This work extends the energy range used in previous reflectivity studies and adds polarization dependence. The EUV probe is known to be sensitive to lattice dynamics, since in this range the reflectivity is essentially unaffected by the photo-excited surface plasma. The exploitation of both s- and p-polarized EUV radiation permits variation of the penetration depth of the probe; a significant increase in the characteristic time is observed upon increasing the probing depth (1 vs. 5 ps) due to hydrodynamic expansion and consequent destruction of the excited region, implying that there is only a short window during which the probed region is in the isochoric regime. A weak wavelength dependence of the reflectivity is found, consistent with previous measurements and implying a maximum electronic temperature of 0.8 eV ± 0.4.},
doi = {10.3390/photonics7020035},
journal = {Photonics},
number = 2,
volume = 7,
place = {Switzerland},
year = {2020},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: https://doi.org/10.3390/photonics7020035

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