Abstract
We present optimization of laser plasma x-ray experimental conditions for ultrafast x-ray absorption spectroscopy measurements on broad range of transition metal oxides. First, the x-ray flux generated from a laser plasma source was optimized with an emphasis on the Bremsstrahlung by investigating the influence of the angle of the incidence of laser beam on a Cu tape target. The x-ray flux emitted in both the front and transmitted side of the target was found to be optimal at the incident angle of 15 ~ 25 degrees. Moreover the manipulation of the Bremsstrahlung peak energy by the laser focus distribution was discussed. In addition to the source optimization, we present a scheme to find the time-delay zero position in a pump-probe experiment together with a normalization scheme for x-ray source fluctuations. As a feasibility check, we present the transmitted spectra of two materials, Ni and NiO.
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Iqbal, M., Ijaz, M., Noh, D.Y. et al. Optimization of a laser plasma x-ray source for ultrafast x-ray absorption spectroscopy. Journal of the Korean Physical Society 70, 905–911 (2017). https://doi.org/10.3938/jkps.70.905
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DOI: https://doi.org/10.3938/jkps.70.905