学术报告:Soft x-ray experiments of liquids and solutions under atmospheric pressure: from developments of the flow cell for liquids to findings in liquid water

2017/12/18 | 【 【打印】【关闭】 | 访问次数:
  报告题目:Soft x-ray experiments of liquids and solutions under atmospheric pressure: from developments of the flow cell for liquids to findings in liquid water
  报 告 人:Dr. Takashi Tokushima
SANKA High Technology Co. Ltd., 90-1 Kurimachi, Shingu-cho, Tatsuno-shi, Hyogo 678-5148, Japan Laboratory of Advanced Science and Technology for Industry, University of Hyogo, Japan
  报告时间:2017年12月28日 周四 上午九点半
  报告地点:张江科研楼503室
  
  Abstract:
  Experiments using soft x-rays (around 400 to 1000eV) is normally considered to require vacuum condition because of strong absorption by oxygen and nitrogen molecules in air. However, owing to recent developments of experimental apparatus and technique, soft x-ray spectroscopy is becoming one of a choice for experimental study of samples under atmospheric pressure. Since x-ray absorption and x-ray emission spectroscopy are known as a direct methods to observe valence electronic state, these method will provide electronic structure which is important for broad fields of science including chemistry.
  In the talk, soft x-ray studies concerning liquids at SPring-8 BL17SU will be introduced in detail from developments of experimental apparatus. The study was started around 10 years ago by developing liquid flow cell using ultra-thin (~150nm) film windows, which enable photon-in photon-out experiments of soft x-rays, becomes available for liquids and solutions. A new grazing incident x-ray emission spectrometer liquid nitrogen cooling CCD detector was also developed to achieve high efficiency detection. In addition, experimental method was also required to develop because there was only a few paper for liquid using soft x-ray emission spectroscopy when we started the study. For example, selective observation of molecule in solution by resonance excitation was demonstrated to observe electronic state of solute molecule in solution by our experiments. 
  As mentioned above, X-ray emission and absorption spectroscopy provide information of occupied and unoccupied valence electronic state. Interestingly, for liquid water, X-ray emission spectra triggered debates on the liquid structure of water since spectra contains information beyond the electronic structure. In the talk, soft x-ray spectroscopy and liquid structure will be discussed, and recent results on chemical reaction on electrode related to a future plans will be also introduced.

  References
  1.T. Tokushima, Y. Horikawa and S. Shin, Review of Scientific Instruments, 2011, 82, 073108.
  2.T. Tokushima, Y. Harada, O. Takahashi, Y. Senba, H. Ohashi, L. G. M. Pettersson, A. Nilsson and S. Shin, Chemical Physics Letters, 2008, 460, 387-400.
  3.T. Tokushima, Y. Horikawa, H. Arai, Y. Harada, O. Takahashi, L. G. M. Pettersson, A. Nilsson and S. Shin, The Journal of Chemical Physics, 2012, 136, 044517-044517.
  4.T. Tokushima, Y. Horikawa, Y. Harada, O. Takahashi, A. Hiraya and S. Shin, Physical Chemistry Chemical Physics, 2009, 11, 1679-1682.
  5.Y. Horikawa, T. Tokushima, Y. Harada, O. Takahashi, A. Chainani, Y. Senba, H. Ohashi, A. Hiraya and S. Shin, Physical Chemistry Chemical Physics, 2009, 11, 8676-8679.
  6.Y. Horikawa, T. Tokushima, A. Hiraya and S. Shin, Physical Chemistry Chemical Physics, 2010, 12, 9165-9168.
  7.H. Arai, Y. Horikawa, K. Sadakane, T. Tokushima, Y. Harada, Y. Senba, H. Ohashi, Y. Takata and S. Shin, Physical Chemistry Chemical Physics, 2012, 14, 1576-1580.
  8.T. Tokushima, Y. Horikawa, O. Takahashi, H. Arai, K. Sadakane, Y. Harada, Y. Takata and S. Shin, Physical Chemistry Chemical Physics, 2014, 16, 10753-10761.
  9.T. Ishihara, T. Tokushima, Y. Horikawa, M. Kato, I. Yagi, Review of Scientific Instruments, 2017, 88, 104101.

  Short CV:
---------------------------------
  Takashi TOKUSHIMA, Ph.D
  Reserchgate profile: https://www.researchgate.net/profile/Takashi_Tokushima
  Google scholar profile: https://scholar.google.co.jp/citations?user=GoC8kgMAAAAJ&hl=ja
  Education
  March 2003, Ph D (Doctor of Science), Department of Physical Science, Graduate School of Science, Hiroshima University, Japan (Supervisor: Atsunari Hiraya)
  March 2000, M.S., Department of Physical Science, Graduate School of Science, Hiroshima University, Japan
  March 1998, B.A., Department of Material Science, Faculty of Science, Hiroshima University, Japan

  Research experience
  November 2017 - present  CTO, SANKA High Technology Co. Ltd.
  April 2014 - present  Guest researcher, Laboratory of Advanced Science and Technology for Industry, University of Hyogo
  April 2013 - November 2017  Engineering scientist, Soft X-ray Spectroscopy Instrumentation Unit, RIKEN, SPring-8 center
  April 2012 - March 2013  Engineering scientist, Research Infrastructure Group, RIKEN SPring-8 center
  April 2007 - March 2012  Researcher, Excitation order research team, RIKEN SPring-8 center
  April 2006 - March 2007  Researcher, Quantum Electronic Materials Research Team, RIKEN SPring-8 center
  April 2003 - March 2006  Special Postdoctoral Researcher (SPDR), Soft X-ray Spectroscopy Lab., RIKEN Harima Institute
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