General Introduction to Mössbauer Spectroscopy - Mossbauer Spectroscopy - page 19

Fig. 1.11 Energy spectrum
of nuclear resonant scattering
from a-Fe foil at room
temperature, reported by Seto
et al. [ 29 ]. Dotted line is a
contribution of multi-phonon
excitations [ 29 ]
By the observation of quantum beat X, one can determine the details on the
nuclear levels, from which the hyperfine interaction parameters are evaluated
precisely.
1.4.2 Inelastic Scattering
High-resolution monochrometor reduces the bandwidth of the synchrotron radi-
ation and also can scan the radiation energy in the region of meV that is the
energy range of the phonon in the scattering material. Using the synchrotron
radiation, it is possible to observe the nuclear inelastic scattering process that is
the creation of phonon and the annihilation of phonon by the interaction between
synchrotron radiation and scattering material. Figure 1.11 shows the energy
profile of the inelastic scattering photons obtained from a-Fe at 300 K, which was
a first successful observation of a nuclear inelastic resonance spectrum associated
with the excitation of the lattice phonons [ 29 ]. From the inelastic scattering, the
localized partial density of phonon state of scattering material can be determined
[ 29 , 30 ].
1.5 Summary
In this chapter, a general introduction to the Mössbauer spectroscopy has been
described. First the Mössbauer effect with recoilless emission and absorption of
nuclear c-ray using radioactive source is described and emphasized the extremely
narrow bandwidth that is the most important feature of the Mössbauer spectroscopy;