Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet
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 prob...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-05-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/7/2/35 |
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| author | Sumana L. Raj Shane W. Devlin Riccardo Mincigrucci Craig P. Schwartz Emiliano Principi Filippo Bencivenga Laura Foglia Alessandro Gessini Alberto Simoncig Gabor Kurdi Claudio Masciovecchio Richard J. Saykally |
| author_facet | Sumana L. Raj Shane W. Devlin Riccardo Mincigrucci Craig P. Schwartz Emiliano Principi Filippo Bencivenga Laura Foglia Alessandro Gessini Alberto Simoncig Gabor Kurdi Claudio Masciovecchio Richard J. Saykally |
| author_sort | Sumana L. Raj |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T19:38:20Z |
| format | Article |
| id | doaj.art-16a7e635e92c41cd81a4f7bcfa69e61b |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-10T19:38:20Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj.art-16a7e635e92c41cd81a4f7bcfa69e61b2023-11-20T01:29:51ZengMDPI AGPhotonics2304-67322020-05-01723510.3390/photonics7020035Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme UltravioletSumana L. Raj0Shane W. Devlin1Riccardo Mincigrucci2Craig P. Schwartz3Emiliano Principi4Filippo Bencivenga5Laura Foglia6Alessandro Gessini7Alberto Simoncig8Gabor Kurdi9Claudio Masciovecchio10Richard J. Saykally11Department of Chemistry, University of California, Berkeley, CA 94720, USADepartment of Chemistry, University of California, Berkeley, CA 94720, USAElettra Sincrotrone Trieste SCpA, Basovizza, 34149 Trieste, ItalyMolecular Foundry, Lawrence Berkeley National Lab, Berkeley, CA 94720, USAElettra Sincrotrone Trieste SCpA, Basovizza, 34149 Trieste, ItalyElettra Sincrotrone Trieste SCpA, Basovizza, 34149 Trieste, ItalyElettra Sincrotrone Trieste SCpA, Basovizza, 34149 Trieste, ItalyElettra Sincrotrone Trieste SCpA, Basovizza, 34149 Trieste, ItalyElettra Sincrotrone Trieste SCpA, Basovizza, 34149 Trieste, ItalyElettra Sincrotrone Trieste SCpA, Basovizza, 34149 Trieste, ItalyElettra Sincrotrone Trieste SCpA, Basovizza, 34149 Trieste, ItalyDepartment of Chemistry, University of California, Berkeley, CA 94720, USAUltrafast 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.https://www.mdpi.com/2304-6732/7/2/35liquid carbonEUVfree electron laserreflectivitypump-probepolarization |
| spellingShingle | Sumana L. Raj Shane W. Devlin Riccardo Mincigrucci Craig P. Schwartz Emiliano Principi Filippo Bencivenga Laura Foglia Alessandro Gessini Alberto Simoncig Gabor Kurdi Claudio Masciovecchio Richard J. Saykally Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet Photonics liquid carbon EUV free electron laser reflectivity pump-probe polarization |
| title | Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet |
| title_full | Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet |
| title_fullStr | Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet |
| title_full_unstemmed | Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet |
| title_short | Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet |
| title_sort | free electron laser measurement of liquid carbon reflectivity in the extreme ultraviolet |
| topic | liquid carbon EUV free electron laser reflectivity pump-probe polarization |
| url | https://www.mdpi.com/2304-6732/7/2/35 |
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