Ultrafast heat transfer in single palladium nanocrystals seen with an X-ray free-electron laser
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arXiv
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| Autores principales: | , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
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| _version_ | 1866910016783515648 |
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| author | Yang, David Wrigley, James Griffiths, Jack Wu, Longlong Suzana, Ana F. Diao, Jiecheng Rodriguez-Fernandez, Angel Hallmann, Joerg Zozulya, Alexey Boesenberg, Ulrike Shayduk, Roman Pudell, Jan-Etienne Madsen, Anders Robinson, Ian K. |
| author_facet | Yang, David Wrigley, James Griffiths, Jack Wu, Longlong Suzana, Ana F. Diao, Jiecheng Rodriguez-Fernandez, Angel Hallmann, Joerg Zozulya, Alexey Boesenberg, Ulrike Shayduk, Roman Pudell, Jan-Etienne Madsen, Anders Robinson, Ian K. |
| contents | We report transient highly strained structural states in individual palladium (Pd) nanocrystals, electronically heated using an optical laser, which precede their uniform thermal expansion. Using an X-ray free-electron laser probe, the evolution of individual 111 Bragg peaks is measured as a function of delay time at various laser fluences. Above a laser fluence threshold at a sufficient pump-probe delay, the Bragg peak splits into multiple peaks, indicating heterogeneous strain, before returning to a single peak, corresponding to even heat distribution throughout the lattice expanded crystal. Our findings are supported by a lattice displacement and strain model of a single nanocrystal at different delay times, which agrees with the experimental data. Our observations have implications for understanding femtosecond laser interactions with metals and the potential photo-catalytic performance of Pd. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_21670 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ultrafast heat transfer in single palladium nanocrystals seen with an X-ray free-electron laser Yang, David Wrigley, James Griffiths, Jack Wu, Longlong Suzana, Ana F. Diao, Jiecheng Rodriguez-Fernandez, Angel Hallmann, Joerg Zozulya, Alexey Boesenberg, Ulrike Shayduk, Roman Pudell, Jan-Etienne Madsen, Anders Robinson, Ian K. Materials Science We report transient highly strained structural states in individual palladium (Pd) nanocrystals, electronically heated using an optical laser, which precede their uniform thermal expansion. Using an X-ray free-electron laser probe, the evolution of individual 111 Bragg peaks is measured as a function of delay time at various laser fluences. Above a laser fluence threshold at a sufficient pump-probe delay, the Bragg peak splits into multiple peaks, indicating heterogeneous strain, before returning to a single peak, corresponding to even heat distribution throughout the lattice expanded crystal. Our findings are supported by a lattice displacement and strain model of a single nanocrystal at different delay times, which agrees with the experimental data. Our observations have implications for understanding femtosecond laser interactions with metals and the potential photo-catalytic performance of Pd. |
| title | Ultrafast heat transfer in single palladium nanocrystals seen with an X-ray free-electron laser |
| topic | Materials Science |
| url | https://arxiv.org/abs/2508.21670 |