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21 September 2005 Study of a soft x-ray (1-5 nm) laser plasma source for femtosecond time resolved XAS
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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.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);


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