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

1
Department of Chemistry, University of California, Berkeley, CA 94720, USA
2
Chemical Sciences Division, Lawrence Berkeley National Lab, Berkeley, CA 94720, USA
3
Elettra Sincrotrone Trieste SCpA, Basovizza, 34149 Trieste, Italy
4
Molecular Foundry, Lawrence Berkeley National Lab, Berkeley, CA 94720, USA
*
Authors to whom correspondence should be addressed.
Photonics 2020, 7(2), 35; https://doi.org/10.3390/photonics7020035
Received: 13 April 2020 / Revised: 16 May 2020 / Accepted: 21 May 2020 / Published: 23 May 2020
(This article belongs to the Section Lasers, Light Sources and Sensors)
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. View Full-Text
Keywords: liquid carbon; EUV; free electron laser; reflectivity; pump-probe; polarization liquid carbon; EUV; free electron laser; reflectivity; pump-probe; polarization
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MDPI and ACS Style

Raj, S.L.; Devlin, S.W.; Mincigrucci, R.; Schwartz, C.P.; Principi, E.; Bencivenga, F.; Foglia, L.; Gessini, A.; Simoncig, A.; Kurdi, G.; Masciovecchio, C.; Saykally, R.J. Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet. Photonics 2020, 7, 35. https://doi.org/10.3390/photonics7020035

AMA Style

Raj SL, Devlin SW, Mincigrucci R, Schwartz CP, Principi E, Bencivenga F, Foglia L, Gessini A, Simoncig A, Kurdi G, Masciovecchio C, Saykally RJ. Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet. Photonics. 2020; 7(2):35. https://doi.org/10.3390/photonics7020035

Chicago/Turabian Style

Raj, Sumana L.; Devlin, Shane W.; Mincigrucci, Riccardo; Schwartz, Craig P.; Principi, Emiliano; Bencivenga, Filippo; Foglia, Laura; Gessini, Alessandro; Simoncig, Alberto; Kurdi, Gabor; Masciovecchio, Claudio; Saykally, Richard J. 2020. "Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet" Photonics 7, no. 2: 35. https://doi.org/10.3390/photonics7020035

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