Various methods for X-ray pulse generation using a femtosecond laser and their potential for time-resolved X-ray analyses

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  • HATANAKA Koji
    Department of Chemsitry, Graduate School of Science, Tohoku University
  • MIURA Toshifumi
    Department of Chemsitry, Graduate School of Science, Tohoku University
  • ODAKA Hideho
    Department of Chemsitry, Graduate School of Science, Tohoku University
  • ONO Hiroshi
    Department of Chemsitry, Graduate School of Science, Tohoku University
  • FUKUMURA Hiroshi
    Department of Chemsitry, Graduate School of Science, Tohoku University

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Other Title
  • フェムト秒レーザーを用いる各種パルスＸ線発生法と時間分解Ｘ線分析への応用の可能性
  • フェムトビョウ レーザー オ モチイル カクシュ パルス Xセン ハッセイホウ ト ジカン ブンカイ Xセン ブンセキ エ ノ オウヨウ ノ カノウセイ

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Abstract

Three different methods for X-ray pulse generation with femtosecond laser pulses were outlined. The first method was with a photo-excitable X-ray tube irradiated by femtosecond laser pulses. The X-ray emission spectrum was composed of a broad component and some characteristic X-ray lines. The X-ray pulse width was calculated to be about 20 ps, based on an equation of the electron motion in the tube. The second method was by the irradiation of focused femtosecond laser pulses onto electrolyte aqueous solution jets, such as a cesium chloride aqueous solution. The X-ray emission spectra showed solute-dependent characteristic X-ray lines and broad bremsstrahlung backgrounds up to 40 keV. Under double-pulse excitation onto a distilled water jet, the X-ray intensity was about 103-times higher than the case excited by single pulse. The third method was by the irradiation of focused femtosecond laser pulses onto cassette tapes. The characteristic X-ray lines of Fe Kα and Kβ were clearly observed in addition to a broad bremsstrahlung background. By using this X-ray pulse source, an X-ray diffractometer was developed. An X-ray diffraction image of LiF (200) was clearly taken by an X-ray image intensifier and a cooled CCD camera.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 52 (6), 373-381, 2003

    The Japan Society for Analytical Chemistry

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