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Journal Article

Evidence for ultra-fast heating in intense-laser irradiated reduced-mass targets.

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Yin,  Z.
Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for biophysical chemistry, Max Planck Society;

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Citation

Neumayer, P., Aurand, B., Costa Fraga, R. A., Ecker, B., Grisenti, R. E., Gumberidze, A., et al. (2012). Evidence for ultra-fast heating in intense-laser irradiated reduced-mass targets. Physics of plasmas, 19: 122708. doi:10.1063/1.4772773.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-B923-D
Abstract
We report on an experiment irradiating individual argon droplets of 20 lm diameter with laser pulses of several Joule energy at intensities of 1019 W/cm2. K-shell emission spectroscopy was employed to determine the hot electron energy fraction and the time-integrated charge-state distribution. Spectral fitting indicates that bulk temperatures up to 160 eV are reached. Modelling of the hot-electron relaxation and generation of K-shell emission with collisional hot-electron stopping only is incompatible with the experimental results, and the data suggest an additional ultra-fast (sub-ps) heating contribution. For example, including resistive heating in the modelling yields a much better agreement with the observed final bulk temperature and qualitatively reproduces the observed charge state distribution.