|Title||Photon energy dependence of graphitization threshold for diamond irradiated with intense XUV FEL pulse|
|Publication Type||Journal Article|
|Year of Publication||2013|
|Authors||J. Gaudin, V.V Medvedev, J. Chalupsky, T. Burian, D S. Farahani, V. Hajkova, M. Harmand, H.O. Jeschke, L. Juha, M. Jurek, D. Klinger, J. Krzywinski, R.A Loch, S. Moeller, M. Nagasono, C. Ozkan, K. Saksl, H. Sinn, R. Sobierajski, P. Sovak, S. Toleikis, K. Tiedtke, M. Toufarova, T. Tschentscher, V. Vorlicek, L. Vysin, H. Wabnitz, B. Ziaja|
|Journal||Physical Review B|
We studied experimentally and theoretically the structural transition of diamond under an irradiation with an intense femtosecond extreme ultraviolet laser (XUV) pulse of 24–275 eV photon energy provided by free-electron lasers. Experimental results obtained show that the irradiated diamond undergoes a solid-to-solid phase transition to graphite, and not to an amorphous state. Our theoretical findings suggest that the nature of this transition is nonthermal, stimulated by a change of the interatomic potential triggered by the excitation of valence electrons. Ultrashort laser pulse duration enables to identify the subsequent steps of this process: electron excitation, band gap collapse, and the following atomic motion. A good agreement between the experimentally measured and theoretically calculated damage thresholds for the XUV range supports our conclusions.
|Alternate Title||Phys. Rev. B|
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