Evidence for phonon hardening in laser-excited gold using x-ray diffraction at a hard x-ray free electron laser.
Sci Adv
; 10(6): eadh5272, 2024 Feb 09.
Article
en En
| MEDLINE
| ID: mdl-38335288
ABSTRACT
Studies of laser-heated materials on femtosecond timescales have shown that the interatomic potential can be perturbed at sufficiently high laser intensities. For gold, it has been postulated to undergo a strong stiffening leading to an increase of the phonon energies, known as phonon hardening. Despite efforts to investigate this behavior, only measurements at low absorbed energy density have been performed, for which the interpretation of the experimental data remains ambiguous. By using in situ single-shot x-ray diffraction at a hard x-ray free-electron laser, the evolution of diffraction line intensities of laser-excited Au to a higher energy density provides evidence for phonon hardening.
Texto completo:
1
Banco de datos:
MEDLINE
Idioma:
En
Año:
2024
Tipo del documento:
Article