Ultrafast anisotropic disordering in graphite driven by intense hard X-ray pulses

0511156 - FZÚ 2020 RIV GB eng J - Journal Article
Hartley, N.J. - Grenzer, J. - Lu, W. - Huang, L.G. - Inubushi, Y. - Kamimura, N. - Katagiri, K. - Kodama, R. - Kon, A. - Lipp, V. - Makita, M. - Matsuoka, T. - Medvedev, Nikita - Nakajima, S. - Ozaki, N. - Pikuz, T. - Rode, A.V. - Rohatsch, K. - Sagae, D. - Schuster, A.K. - Tono, K. - Vorberger, J. - Yabuuchi, T. - Kraus, D.
Ultrafast anisotropic disordering in graphite driven by intense hard X-ray pulses.
High energy density physics. Roč. 32, July (2018), s. 63-69. ISSN 1574-1818. E-ISSN 1878-0563
R&D Projects: GA MŠMT LG15013; GA MŠMT LTT17015
EU Projects: European Commission(XE) 654148 - LASERLAB-EUROPE
Institutional support: RVO:68378271
Keywords : ultrafast melting * nonthermal melting * X-ray heating * diffraction
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 1.655, year: 2018
Method of publishing: Open access

We present results from the SPring-8 Angstrom Compact free electron LAser (SACLA) X-ray free electron laser (XFEL) facility, using an X-ray pump, X-ray probe scheme to observe ultrafast changes in the structure of heated graphite. The 9.8 keV XFEL beam was focused to give an intensity on the order of ∼1019 W/cm2, and the evolution of the diffraction pattern observed up to delays of 300 fs. The interplanar diffraction peaks weaken significantly within 10s of femtoseconds. We interpret this as nonthermal damage through the breaking of interplanar bonds, which at longer timescales leads to ablation by removal of intact graphite sheets. Postexperiment examination of the graphite samples shows damage which is comparable in size to the range of the excited photoelectrons.
Permanent Link: http://hdl.handle.net/11104/0301492