Seminars Archive

Development of quasi-elastic scattering experiments of neV-energy resolution by using synchrotron radiation

Abstract
To study the slow dynamics of the time scale of 100 ns, quasi-elastic scattering experiments by using nuclear resonant scattering (NRS) have been developed recently [1,2]. Since the NRS by the first excited state of 57Fe nuclei has the energy of 14.4 keV and the lifetime of 98.1 ns (which corresponds to the energy band width of 4.7 neV), the quasi-elastic scattering experiment using the NRS as a probe beam enables us to observe microscopic fluctuations of the time scale of 100 ns. As a time-domain analog of this quasi-elastic scattering experiment, we developed a time-domain interferometry (TDI) method to study microscopic slow dynamics of super-cooled liquids. The dynamics of o-terphenyl and ionic liquid BmimI were studied by analyzing TDI time spectra and we confirmed temperature dependences of structural relaxation times in o-terphenyl and BmimI follow Vogel-Fulcher-Tammann (VFT) law for o-terphenyl. [1] A. Q. Baron, H. Franz, A. Meyer, R. Rüffer, A. I. Chumakov, E. Burkel, W. Petry, Phys. Rev. Lett, 79, 2823, (1997). [2] M. Saito, M. Seto, S. Kitao, Y. Kobayashi, S. Higashitaniguchi, M. Kurokuzu, M. Sugiyama, Y. Yoda, Appl. Phys. Express, 2, 026502, (2009).