Journal Article Nuclear resonant scattering of synchrotron radiation by physisorbed Kr on TiO2(110) surfaces in multilayer and monolayer regimes

Ikeda, Akihiko  ,  Kawauchi, Taizo  ,  Okano, Tatsuo  ,  Fukutani, Katsuyuki  ,  Matsumoto, Masuaki  ,  Xiao Wei Zhang  ,  Yoda, Yoshitaka

91 ( 15 ) 2015-04-03 , American Physical Society , Institute of Industrial Science, The University of Tokyo , Natural Science Division, Tokyo Gakugei University , Institute of Industrial Science, The University of Tokyo , Institute of Material Structure Science, High Energy Accelerator Research Organization (KEK) , Japan Synchrotron Radiation Research Institute (JASRI)/SPring-8
ISSN:1550-235X (online)
Physisorbed Kr layers on TiO2(110) surfaces were investigated by means of nuclear resonant scattering (NRS) of synchrotron radiation at Kr thicknesses ranging from multilayer to monolayer. The NRS intensity was measured as a function of the Kr exposure, from which the NRS signal corresponding to monolayer was estimated as 0.23 cps. The time spectra measured at various thicknesses showed a monotonous decay without any quantum beat features. The recoilless fraction f evaluated from the analysis of the time spectrum revealed a substantial reduction upon temperature rise from 19 to 25 K. As its origin, an order-disorder phase transition of the monolayer Kr is proposed.

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