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Title: Evidence for phonon hardening in laser-excited gold using x-ray diffraction at a hard x-ray free electron laser

Journal Article · · Science Advances
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [2];  [2]; ORCiD logo [2]; ORCiD logo [2];  [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [4]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [7]; ORCiD logo [2]; ORCiD logo [8]
  1. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford Univ., CA (United States); Queen's Univ., Belfast, Northern Ireland (United Kingdom); SLAC
  2. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  3. CEA/DAM DIF, Bruyères le Châtel (France); Univ. Paris-Saclay, Bruyères-le-Châtel (France)
  4. CEA/DAM DIF, Bruyères le Châtel (France); Univ. Paris-Saclay, Bruyères-le-Châtel (France)
  5. Univ. of Rostock (Germany)
  6. Stanford Univ., CA (United States)
  7. Univ. of Nevada, Reno, NV (United States)
  8. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Queen's Univ., Belfast, Northern Ireland (United Kingdom)

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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); Deutsche Forschungsgemeinschaft (DFG)
Grant/Contract Number:
AC02-76SF00515; NA0004039
OSTI ID:
2396814
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 6 Vol. 10; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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