Study of a soft x-ray (1-5 nm) laser plasma source for femtosecond time resolved XAS

S. Fourmaux; L. Lecherbourg; J. C. Kieffer; F. Martin; H. Pépin; M. Chaker; S. Magnan; C. Y. Coté

doi:10.1117/12.619271

21 September 2005 Study of a soft x-ray (1-5 nm) laser plasma source for femtosecond time resolved XAS

S. Fourmaux, L. Lecherbourg, J. C. Kieffer, F. Martin, H. Pépin, M. Chaker, S. Magnan, C. Y. Coté

Author Affiliations +

Proceedings Volume 5920, Ultrafast X-Ray Detectors, High-Speed Imaging, and Applications; 592004 (2005) https://doi.org/10.1117/12.619271
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

The dynamics of ultrafast phase transition and reaction mechanisms can be deduced from ultrafast x-ray diffraction or absorption measurements. Femtosecond lasers have been used recently to study matter dynamics with optical-pump and x-ray probe spectroscopy, using monochromatic K alpha x-ray radiation. We present here our most recent progress in the development of a femtosecond time- resolved x-ray absorption spectroscopy (XAS) system based on a broadband soft x-ray source in the 1-5 nm range. The femtosecond XAS system is designed to probe the electronic dynamics occurring during the vanadium dioxide (VO₂) semiconductor to metal phase transition following excitation by a femtosecond laser pulse. In the present experiments, broadband spectra near the vanadium L edge (511 eV) and oxygen K edge (525 eV) of VO₂ have been generated and measured with simultaneously high signal to noise ratio (100), high spectral resolution (ΔE/E=4x10^-3) and a 1.2 ps temporal resolution.

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S. Fourmaux, L. Lecherbourg, J. C. Kieffer, F. Martin, H. Pépin, M. Chaker, S. Magnan, and C. Y. Coté "Study of a soft x-ray (1-5 nm) laser plasma source for femtosecond time resolved XAS", Proc. SPIE 5920, Ultrafast X-Ray Detectors, High-Speed Imaging, and Applications, 592004 (21 September 2005); https://doi.org/10.1117/12.619271

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