Nonisotropic atomic motion in a nonthermal phase transition of diamond (Conference Presentation)

Philip A. Heimann; Nicholas Hartley; Ichiro Inoue; Andre Antoine; Fabien Dorchies; Roger Falcone; Jérôme Gaudin; Hauke Höppner; Yuichi Inubushi; Hae Ja Lee; Vladimir Lipp; Paloma Martinez; Nikita Medvedev; Franz Tavella; Victor Tkachenko; Sven Toleikis; Makina Yabashi; Toshinori Yabuuchi; Jumpei Yamada; Beata Ziaja-Motyka

doi:10.1117/12.2669316

6 June 2023 Nonisotropic atomic motion in a nonthermal phase transition of diamond (Conference Presentation)

Philip A. Heimann, Nicholas Hartley, Ichiro Inoue, Andre Antoine, Fabien Dorchies, Roger Falcone, Jérôme Gaudin, Hauke Höppner, Yuichi Inubushi, Hae Ja Lee, Vladimir Lipp, Paloma Martinez, Nikita Medvedev, Franz Tavella, Victor Tkachenko, Sven Toleikis, Makina Yabashi, Toshinori Yabuuchi, Jumpei Yamada, Beata Ziaja-Motyka

Author Affiliations +

Proceedings Volume 12578, Optics Damage and Materials Processing by EUV/X-ray Radiation (XDam8); 1257808 (2023) https://doi.org/10.1117/12.2669316
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

X-ray Free Electron Laser (XFEL) radiation may transform diamond into graphite. Two X-ray pulses were used; the first as pump to trigger the phase transition and the second as probe performing X-ray diffraction. The experiment was performed at the SACLA XFEL facility at the beamline 3 experimental hutch 5. The samples were polycrystalline diamond. The pump and probe photon energies were 7 and 10.5 keV, respectively, and the delay between the X-ray pulses was varied from 0 to 286 fs. To provide a range of energy densities, the X-ray focus was adjusted between 150 nm and 1 um. The (111), (220) and (311) diffraction peaks were observed. The intensity of each diffraction peak decreased with time indicating a disordering of the crystal lattice. From a Debye-Waller analysis, the root-mean-square (rms) atomic displacement perpendicular to particular lattice planes are calculated. At higher fluences, the rms atomic displacement perpendicular to the (111) planes is significantly larger than that perpendicular to the (220) or (311) planes. By accepting two successive XFEL pulses at a time delay of 33 ms, graphite (002) diffraction was observed beginning at a threshold dose of 1.7 eV/atom. The experimental results will be compared with calculations using a hybrid model based on tight-binding molecular dynamics.

Conference Presentation

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Philip A. Heimann, Nicholas Hartley, Ichiro Inoue, Andre Antoine, Fabien Dorchies, Roger Falcone, Jérôme Gaudin, Hauke Höppner, Yuichi Inubushi, Hae Ja Lee, Vladimir Lipp, Paloma Martinez, Nikita Medvedev, Franz Tavella, Victor Tkachenko, Sven Toleikis, Makina Yabashi, Toshinori Yabuuchi, Jumpei Yamada, and Beata Ziaja-Motyka "Nonisotropic atomic motion in a nonthermal phase transition of diamond (Conference Presentation)", Proc. SPIE 12578, Optics Damage and Materials Processing by EUV/X-ray Radiation (XDam8), 1257808 (6 June 2023); https://doi.org/10.1117/12.2669316

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KEYWORDS

Diamond

X-rays

Diffraction

Graphite

X-ray diffraction

Crystals

Free electron lasers

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