Probing warm dense matter using femtosecond X-ray absorption spectroscopy with a laser-produced betatron source - Archive ouverte HAL Access content directly
Journal Articles Nature Communications Year : 2018

Probing warm dense matter using femtosecond X-ray absorption spectroscopy with a laser-produced betatron source

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Kim Ta Phuoc
Jean-Philippe Goddet
Agustin Lifschitz
P. Renaudin
  • Function : Author
L. Lecherbourg

Abstract

Exploring and understanding ultrafast processes at the atomic level is a scientific challenge. Femtosecond X-ray absorption spectroscopy (XAS) arises as an essential experimental probing method, as it can simultaneously reveal both electronic and atomic structures, and thus potentially unravel their nonequilibrium dynamic interplay which is at the origin of most of the ultrafast mechanisms. However, despite considerable efforts, there is still no femtosecond X-ray source suitable for routine experiments. Here we show that betatron radiation from relativistic laser-plasma interaction combines ideal features for femtosecond XAS. It has been used to investigate the nonequilibrium dynamics of a copper sample brought at extreme conditions of temperature and pressure by a femtosecond laser pulse. We measured a rise-time of the electron temperature below 100 fs. This experiment demonstrates the great potential of the table-top betatron source which makes possible the investigation of unexplored ultrafast processes in manifold fields of research.

Dates and versions

hal-01877671 , version 1 (20-09-2018)

Identifiers

Cite

B. Mahieu, N. Jourdain, Kim Ta Phuoc, F. Dorchies, Jean-Philippe Goddet, et al.. Probing warm dense matter using femtosecond X-ray absorption spectroscopy with a laser-produced betatron source. Nature Communications, 2018, 9, pp.3276. ⟨10.1038/s41467-018-05791-4⟩. ⟨hal-01877671⟩
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