Moments in nuclear resonant inelastic x-ray scattering and their applications

被引:37
|
作者
Hu, Michael Y. [1 ]
Toellner, Thomas S. [1 ]
Dauphas, Nicolas [2 ,3 ]
Alp, E. Ercan [1 ]
Zhao, Jiyong [1 ]
机构
[1] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA
[2] Univ Chicago, Dept Geophys Sci, Origins Lab, Chicago, IL 60637 USA
[3] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA
基金
美国国家科学基金会;
关键词
DENSITY-OF-STATES; MOSSBAUER SUM-RULES; SYNCHROTRON-RADIATION; VIBRATIONAL SPECTROSCOPY; ABSORPTION; DYNAMICS; FRACTIONATION;
D O I
10.1103/PhysRevB.87.064301
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Sum rules of the moments of the nuclear resonant inelastic x-ray scattering (NRIXS) spectrum provide means of data analysis and information on atomic dynamics. We extend existing work by calculating the third and fourth moment beyond the harmonic approximation and show that NRIXS can provide a direct measurement of the anharmonic terms in lattice potentials. Projected partial phonon density of states (ppDOS) extracted from measured spectra provide vibrational mode-specific information on lattice dynamics. Furthermore, unique contributions to thermodynamic properties can be defined and calculated as the moments and other weighted integrals of ppDOS. A summary of some of these thermodynamic quantities is given. The directional dependence of NRIXS and its effects are emphasized. We derive explicit relationships between the moments of phonon excitation probability function and those of ppDOS. The comparison between the two sets of moments provides a consistency check and insights to the lattice dynamics of the system under study. DOI: 10.1103/PhysRevB.87.064301
引用
收藏
页数:13
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