Synchrotron Radiation-Based Nuclear Resonant Scattering: Applications To Bioinorganic Chemistry [chapter]

Yisong Guo, Yoshitaka Yoda, Xiaowei Zhang, Yuming Xiao, Stephen P. Cramer
2013 Mössbauer Spectroscopy  
NFS is a time-domain M€ ossbauer spectroscopy using synchrotron radiation (see Fig. 12 .1 for the comparison between conventional M€ ossbauer spectroscopy and NFS). It is an elastic coherent scattering process, where different nuclear transitions are excited in phase simultaneously by a short X-ray pulse with sufficient energy bandwidth. Shortly after the X-ray pulse, the de-excitations of all the nuclear excited states begin also in phase, but soon the increasing phase difference leads to
more » ... uctive interference and again to a constructive interference. This unique behavior, which is due to the energy differences of the sublevels of nuclear ground states and excited states caused by hyperfine interactions, is the basic process that leads to oscillations (quantum beats, QB) in the nuclear decay of forward-scattered radiation. In the following, we will discuss some special cases to further illustrate the NFS spectral features (for detailed discussion of the theoretical model, one should refer to Refs. 8, [19] [20] [21] . 12.2.1.1 Magnetic Hyperfine Interactions First, we discuss the NFS intensity in the presence of magnetic hyperfine interactions. We assume that the direction of the internal magnetic field in the sample is perpendicular to both
doi:10.1002/9781118714614.ch12 fatcat:lbc5njgfjvc7dbxzjg6cfcsmbe