Is the ultra-fast transformation of bismuth non-thermal?

Details Is the ultra-fast transformation of bismuth non-thermal? Is the ultra-fast transformation of bismuth non-thermal?

2009-10-12

arxiv.org/abs/0910.2150v1

Physics

Optics

20 pages, 6 figures, to be presented at the Conference on Laser Ablation COLA'2009, Singapore, 21-26 November 2009

Scientific paper

Transient state of femtosecond laser excited bismuth has been studied by various groups with time-resolved optical, x-ray, and electron probes at the deposited energy density from below through up to several times the equilibrium enthalpy of melting. However, the interpretations of the experimental results are controversial: the optical probes reveal the absence of transition to the melting phase while the authors of x-ray and electron diffraction experiments claim the observation of ultrafast non-thermal melting. The presented analysis, based on temperature dependence of bismuth optical properties, unequivocally shows a purely thermal nature of all the observed fs-laser induced transformations in bismuth.

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