Soft X-ray Liquid Absorption Spectroscopy in Transmission Mode Realized by Precise Thickness Control

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  • 精密厚さ制御による液体の軟X線透過吸収分光測定
  • 実験技術 精密厚さ制御による液体の軟X線透過吸収分光測定
  • ジッケン ギジュツ セイミツ アツサ セイギョ ニ ヨル エキタイ ノ ナンXセン トウカ キュウシュウ ブンコウ ソクテイ

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<p>X-ray absorption spectroscopy (XAS) is an element specific method to investigate the excitation of a specified core electron to unoccupied states. Since the soft X-ray region covers K-edges of C, N, and O, it is applicable to local structural analyses of molecular liquids. The measurement condition of XAS in the soft X-ray region is not so simple, because soft X-rays are strongly absorbed by air and liquid itself. We have established a precise thickness control method of liquid sample from 20 to 2,000 nm to obtain reliable liquid XAS spectra in transmission mode with optimized absorbance for wide concentration regions. We have investigated local structures of several liquid samples, such as unexpected temperature-dependent structural changes in liquid benzene and concentration dependence of aqueous pyridine solutions, from precise energy shift measurements and inner-shell quantum chemical calculations. The present method will be applicable to local structural analyses of several physical, chemical, and biological phenomena in solution.</p>

Journal

  • Butsuri

    Butsuri 75 (8), 496-503, 2020-08-05

    The Physical Society of Japan

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