Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 108, Issue 47, Pages 18887-18892Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1115237108
Keywords
ultrafast X-ray diffraction; laser-induced phase transition; coherent phonon; annealing; grain growth
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Funding
- W. M. Keck Foundation
- National Natural Science Foundation of China [11004132, 10734130, 10874113]
- National Basic Research Program of China [2007CB815101]
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We utilize 100 fs optical pulses to induce ultrafast disorder of 35- to 150-nm thick single Au(111) crystals and observe the subsequent structural evolution using 0.6-ps, 8.04-keV X-ray pulses. Monitoring the picosecond time-dependent modulation of the X-ray diffraction intensity, width, and shift, we have measured directly electron/phonon coupling, phonon/lattice interaction, and a histogram of the lattice disorder evolution, such as lattice breath due to a pressure wave propagating at sonic velocity, lattice melting, and recrystallization, including mosaic formation. Results of theoretical simulations agree and support the experimental data of the lattice/liquid phase transition process. These time-resolved X-ray diffraction data provide a detailed description of all the significant processes induced by ultrafast laser pulses impinging on thin metallic single crystals.
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