Determination of geometrical structures of molecules by ultrafast gas electron diffraction and gas X ray diffraction

2014 Fiscal Year Final Research Report

• Project/Area Number: 24245003
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Physical chemistry
• Research Institution: The University of Tokyo
• Principal Investigator: YAMANOUCHI Kaoru 東京大学, 理学(系)研究科(研究院), 教授 (40182597)
• Co-Investigator(Renkei-kenkyūsha): KATO Tsuyoshi 東京大学, 理学系研究科, 准教授 (10321986) ; IWASAKI Atsushi 東京大学, 理学系研究科, 准教授 (30447073) ; KANYA Reika 東京大学, 理学系研究科, 助教 (10401168) ; SATO Takahiro 東京大学, 理学系研究科, 助教 (30599113)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 分子構造 / 電子回折 / Ｘ線回折 / 量子動力学計算 / 時間分解

Outline of Final Research Achievements

We developed laser-assisted electron diffraction (LAED) method by which geometrical structures of molecules can be determined with femtosecond temporal resolution. In addition, by recording the diffraction patterns, we demonstrated for the first time that the effect of the creation of light-dressed atoms appears in the scattering angle distributions of the LAED signals. We developed a time-resolved X-ray diffraction (XRD) apparatus for time resolved measurements of geometrical structure of molecules in the gas phase using the XFEL light source, and confirmed that XRD patterns of molecules can be recorded in the wide scattering angle range by using synchrotron radiation of SPring-8. Furthermore, in order to analyze the effect of the electron-nucleus correlation appearing in the LAED and XRD signals, we developed the time-dependent effective potential method based on the extended time-dependent multi-configuration theory, and applied it to the hydrogen molecular model.

Free Research Field

化学