Photon energy dependence of graphitization threshold for diamond irradiated with an intense XUV FEL pulse

  • Gaudin J
  • Medvedev N
  • Chalupský J
 et al. 
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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.

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  • Nikita MedvedevInstitute of Physics - Academy of Sciences of the Czech Republic

  • J. Gaudin

  • J. Chalupský

  • T. Burian

  • S. Dastjani-Farahani

  • V. Hájková

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