Soft X-ray Spectroscopy Instrumentation Unit

The soft x-ray is known to be the most suitable light for investigating the electronic structure of various kinds of materials. The soft x-ray spectroscopy instrumentation unit is primarily in charge of the development, improvement and generalization of various spectroscopic tools as well as cutting-edge utilization technologies for soft x-ray spectroscopy, such as soft x-ray absorption, photoemission, soft x-ray emission and soft x-ray diffraction, in order to advance the optical and materials science by using high brilliant soft x-ray undulator radiation from BL17SU of SPring-8. Our unit is also responsible for providing the infrastructure to raise the user 's convenience and is also going to contribute to advance the spectroscopic study for materials science by means of time-resolved spectroscopy at the next generation light sources, such as X-ray free electron laser.

Research Subjects

• Development, improvement and generalization of cutting-edge utilization technologies for soft x-ray spectroscopy
• Research and development of SR beamline components
• Research and development of pump-probe soft x-ray spectroscopy using high brilliant soft x-ray radiation and femto-second laser
• Modification of nano-carbon materials by ion-beam irradiation and its characterization by soft x-ray spectroscopy
• Development of utilization research for next generation light sources

Publications

1. Honda, S, Nanba, S, Hasegawa, Y, Nosho, Y, Tsukagoshi, A, Niibe, M, Terasawa, M, Hirose, R, Izumi, H, Yoshioka, H, Lee, K. -Y, Niwase, K, Taguchi, E, Oura, M :
   "Defect evolution in multiwalled carbon nanotube films irradiated by Ar ions"
   Jpn. J. Appl. Phys. 51, 110202 (2012).:
2. Kimberg, V, Gejo, T, Oura, M, Tokushima, T, Horikawa, Y, Arai, H, Shin, S, Kosugi, N :
   "Rydberg-valence mixing and interchannel coupling in resonant oxygen 1s inelastic x-ray scattering of O$_2$"
   Phys. Rev. A 85, 032503 (2012).:
3. Gejo, T, Oura, M, Kuniwake, M, Honma, K, Harries, J R :
   "Dissociation and recapture dynamics in H$_2$O following O 1s inner-shell excitation / ionization"
   J. Phys. Conf. Series 288, 012023 (2011).:
4. Nishizawa, K., Kurahashi, N., Sekiguchi, K., Mizuno, T., Ogi, Y., Horio, T., Oura, M., Kosugi, N, Suzuki, T.:
   "High-resolutoin soft x-ray photoelectron spectroscopy of liquid water"
   Phys. Chem. Chem. Phys. 13, 413-417 (2010)
5. Oura, M., Takahashi, O., Gejo, T., Tokushima, T., Horikawa, Y., Senba, Y., Ohashi, H., Shin, S.:
   "Vibrationally resolved resonant x-ray emission spectra of diatomic molecules"
   J. Phys. Conf. Series 235, 012016 (2010)
6. Oura, M.:
   "Study of inner-shell excitation and relaxation processes in atomic and ionic neon by means of soft x-ray spectroscopy"
   Plasma Sci. Technol. 12, 353-369 (2010)
7. Oura, M., Senba, Y., Ohashi, H.:
   "Resonant enhancement of photoemission leading to the Ne$^+$ $[2p^2](^1D)3p$ $^2$P state across the $[1s2p](^3P)3p^2$ $^1$P double-excitation resonance of Ne"
   Phys. Rev. A 77, 054702 (2008)
8. Oura, M., Nakamura, T., Takeuchi, T., Senba, Y., Ohashi, H., Shirasawa, K., Tanaka, T., Takeuchi, M., Furukawa, Y., Hirono, T., Ohata, T., Kitamura, H., Shin, S.:
   "Degree of circular polarization of soft x-rays emitted from a multi-polarization mode undulator characterized by means of magnetic circular dichroism measurements"
   J. Synchrotron Rad. 14, 483-486 (2008)
9. Guo, F.Z., Muro, T., Matsushita, T., Wakita, T., Ohashi, H., Senba, Y., Kinoshita, T., Kobayashi, K., Saitoh, Y., Koshikawa, T., Yasue, T., Oura, M., Takeuchi, T., Shin, S.:
   "Characterization of spectroscopic photoemission and low energy electron microscope using multipolarized soft x rays at BL17SU/SPring-8"
   Rev. Sci. Instrum. 78, 066107 (2007)
10. Oura, M., Tamenori, Y., Koike, F., Hayaishi, T., Yamaoka, H., Koizumi, T., Takahiro, K., Kawatsura, K., Mukoyama, T.:
    "Study of nonradiative decay properties following resonant double excitation to the $[1s2p]nln'l'$ states of Ne atom using soft x-ray undulator radiation"
    Rad. Phys. Chem. 76, 469-474 (2007)