[2Ca07-13] TF/SE/EMP/MI/MS

[2Ca07R] Analysis of vibrational states of H in Pd nanofilm by inelastic neutron scattering

*Takahiro Ozawa¹, Maiko Kofu², Mitsutaka Nakamura², Kazuki Iida³, Toshiya Otomo⁴, Osamu Yamamuro⁵, Ryota Shimizu⁶, Taro Hitosugi⁶, Katsuyuki Fukutani^1,7 (1. Institute of Industrial Science , The University of Tokyo, 2. J-PARC Center, Japan Atomic Energy Agency, 3. Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society, 4. Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 5. Institute for Solid State Physics, The University of Tokyo, 6. School of Materials and Chemical Technology, Tokyo Institute of Technology, 7. Advanced Science Research center, Japan Atomic Energy Agency)

Vibrational states and location of H atoms near two dimensional surfaces are not well known. In the present study, we successfully performed inelastic neutron scattering and obtained vibrational spectra of H in 8-nm-thick Pd films. While the vibrational spectra are similar to those in nanoparticles at low energy region, they are similar to those in bulks at high energy region. It is revealed that the vibrational states of H near flat surfaces are unique and have both characteristics of bulk and nanoparticle.