Institute of Multidisciplinary Research for Advanced Materials, Tohoku University


LAST UPDATE 2017/02/26

  • 研究者氏名
    Researcher Name

    上田潔 Kiyoshi UEDA
    教授 Professor
  • 所属
    Professional Affiliation

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

    Division of Measurements / Electron and Molecular Dynamics
  • 研究キーワード
    Research Keywords

    Electron and molecular dynamics
    Novel measurement methods
    Novel light sources
    Controlling reaction
Research Subject
Investigating and controlling electron and molecular dynamics with novel light sources

研究の背景 Background


Functions of materials are closely related to structures at the atomic level. Researchers are dreaming about watching motions of atoms and electrons during ultrafast structural change. In quantum processes of the microscopic world, electrons have wave nature and thus quantum interference takes place. One has to understand and make use of quantum interference in order to visualize, control and govern the microscopic quantum world.

研究の目標 Outcome


We aim to analyze and control ultrafast reactions such as photoionization, photodissociation, electronic relaxation, electron transfer, isomerization, phase transitions, etc., governed by quantum mechanics, in molecules and nanostructured systems, combining the original and novel measurement methods with the novel light sources such as ultrafast pulse lasers, high-resolution monochromatic soft x-ray synchrotron radiation and x-ray free electron lasers.

研究図Research Figure

Fig.1. Angle- and energy-resolved electron spectra and circular dichroism. Double differential cross section (a,b) and differential circular dichroism (c,d) in He 1 s photoionization at low-NIR laser intensity (7.3 ×1011 Wcm-2). Experimental results are shown in the upper panels, the results of simulations in the lower panels. Fig.2. False-color representation of theoretical photoelectron energy spectra as a function of time delay for the case of the H atom. Above the top axis, the energy positions corresponding to a single IR photon ionization from each of 5p–9p levels are indicated with vertical arrows. The white solid line shows the Kepler orbit time. Fig.3. Correlation maps between the Auger electron kinetic energy and cosθ. Molecular band (upper) and atomic peak (lower) related to decay from the dissociative core-excited σ* state, 1σg−13σu. The double slit interference pattern is observed for the molecular band but absent in the atomic peak.

文献 / Publications

Nature Photonics 9, 120 (2015); Nature Communications 5, doi:10.1038/ncomms5281 (2014); Nature Communications 5, doi:10.1038/ncomms4648 (2014); J. Chem. Phys. 141, 121105 (2014); J. Chem. Phys. 140, 044309 (2014); Phys. Rev. A 90, 023408 (2014); Chem. Phys. 439, 111 (2014); Chem. Phys. 440, 64 (2014).