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2020 年度 実績報告書

Electronic structure characterization of non-aqueous solvents

研究課題

研究課題/領域番号 18K14178
研究機関京都大学

研究代表者

THUERMER STEPHAN  京都大学, 理学研究科, 准教授 (40722161)

研究期間 (年度) 2018-04-01 – 2021-03-31
キーワードelectron spectroscopy / non-aqueous solvents / electronic structure / ionization energy / valence band
研究実績の概要

This project's aim was to study the electronic structure of liquids, with focus on non-aqueous solutions, in novel ways using photoelectron spectroscopy.
For the first time, the full valence band of ethanol and methanol was successfully characterized, which revealed that, unlike water, the molecular character is largely preserved even in the liquid state for these alcohols. The measurement protocol established here will be expanded to acetonitrile, propanol and other chemically relevant liquids in the future.
In parallel, a novel energy-referencing method for measuring absolute ionization energies was developed and applied to liquid water. Measuring accurate ionization energies is a prerequisite to study the electronic structure and chemistry of solutions. Applying this method to above alcohols revealed a distinct energy shift in ethanol, which hints at the presence of surface dipoles from orientated molecules at the liquid's surface. This may pave the way for novel ways to study the surface structure of liquids.
Furthermore, measurements of liquid ammonia with a unprecedented cryogenic liquid-jet have been made possible in international collaboration, which enabled first direct study of a insulator-to-metal transition in an alkali metal-ammonia solution. The gained knowledge was applied to study metallic water-solutions by forming a liquid water layer on a sodium-potassium droplet.
Overall, the project has expanded the scope and applicability of photoelectron spectroscopy to both aqueous and non-aqueous solutions for studying novel phenomena and chemically relevant parameters.

  • 研究成果

    (6件)

すべて 2021 その他

すべて 国際共同研究 (2件) 雑誌論文 (2件) (うち国際共著 1件、 査読あり 2件、 オープンアクセス 1件) 備考 (2件)

  • [国際共同研究] Fritz Haber Institute/Helmholtz Zentrum Berlin/DESY Hamburg(ドイツ)

    • 国名
      ドイツ
    • 外国機関名
      Fritz Haber Institute/Helmholtz Zentrum Berlin/DESY Hamburg
  • [国際共同研究] Czech Academy of Sciences(チェコ)

    • 国名
      チェコ
    • 外国機関名
      Czech Academy of Sciences
  • [雑誌論文] Valence Photoelectron Spectra of Liquid Methanol and Ethanol Measured Using He II Radiation2021

    • 著者名/発表者名
      Thuermer Stephan、Shinno Takatoshi、Suzuki Toshinori
    • 雑誌名

      The Journal of Physical Chemistry A

      巻: 125 ページ: 2492~2503

    • DOI

      10.1021/acs.jpca.1c00288

    • 査読あり
  • [雑誌論文] Low-energy constraints on photoelectron spectra measured from liquid water and aqueous solutions2021

    • 著者名/発表者名
      Malerz Sebastian、Trinter Florian、Hergenhahn Uwe、Ghrist Aaron、Ali Hebatallah、Nicolas Christophe、Saak Clara-Magdalena、Richter Clemens、Hartweg Sebastian、Nahon Laurent、Lee Chin、Goy Claudia、Neumark Daniel M.、Meijer Gerard、Wilkinson Iain、Winter Bernd、Thuermer Stephan
    • 雑誌名

      Physical Chemistry Chemical Physics

      巻: 23 ページ: 8246~8260

    • DOI

      10.1039/D1CP00430A

    • 査読あり / オープンアクセス / 国際共著
  • [備考] Google Scholar User Profile

    • URL

      https://scholar.google.com/citations?user=05yx0h0AAAAJ

  • [備考] University Group Homepage

    • URL

      http://kuchem.kyoto-u.ac.jp/bukka/

URL: 

公開日: 2021-12-27  

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