Non-thermal structural transformation of diamond driven by x-rays

0584107 - FZÚ 2024 RIV US eng J - Journal Article
Heimann, P. - Hartley, N. J. - Inoue, I. - Tkachenko, V. - Antoine, A. - Dorchies, F. - Falcone, R. - Gaudin, J. - Hoeppner, H. - Inubushi, Y. - Kapcia, K. J. - Lee, H. J. - Lipp, V. - Martinez, P. - Medvedev, Nikita - Tavella, F. - Toleikis, S. - Yabashi, M. - Yabuuchi, T. - Yamada, J. - Ziaja, B.
Non-thermal structural transformation of diamond driven by x-rays.
Structural Dynamics. Roč. 10, č. 5 (2023), č. článku 054502. E-ISSN 2329-7778
R&D Projects: GA MŠMT LTT17015; GA MŠMT(CZ) LM2018114; GA MŠMT(CZ) EF18_053/0016627
Institutional support: RVO:68378271
Keywords : non-thermal structural transformation * diamond * intense x-ray pulses * SACLA XFEL facility * experiments and XTANT+ simulation
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 2.8, year: 2022
Method of publishing: Open access

Intense x-ray pulses can cause the non-thermal structural transformation of diamond. At the SACLA XFEL facility, pump x-ray pulses triggered this phase transition, and probe x-ray pulses produced diffraction patterns. Time delays were observed from 0 to 250 fs, and the x-ray dose varied from 0.9 to 8.0 eV/atom. The intensity of the (111), (220), and (311) diffraction peaks decreased with time, indicating a disordering of the crystal lattice. From a Debye-Waller analysis, the rms atomic displacements perpendicular to the (111) planes were observed to be significantly larger than those perpendicular to the (220) or (311) planes. At a long time delay of 33 ms, graphite (002) diffraction indicates that graphitization did occur above a threshold dose of 1.2 eV/atom. These experimental results are in qualitative agreement with XTANT+ simulations using a hybrid model based on density-functional tight-binding molecular dynamics.
Permanent Link: https://hdl.handle.net/11104/0352169