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This community contains research materials created by Gary Collins, professor in the Department of Physics and Astronomy at Washington State University. Collins studies the local structure of ordered solids using nuclear hyperfine interactions. Interactions between quadrupole moments and electric field gradients (EFG) are used to “flag” local environments of radioactive probe atoms. EFGs depend on crystal structure, lattice location, and whether or not there are neighboring point defects. Signal amplitudes give site fractions of probes that can be used to determine defect concentrations as well as thermodynamic properties such as the enthalpies of probe atoms on different sites, formation and migration enthalpies of defects, and enthalpies of interaction between defects and probe atoms. Along with research group, he particularly applies perturbed angular correlation of gamma rays (PAC). His group is the principal PAC group in North America studying solids. They pioneered the use of PAC to study of diffusion of probe atoms jumping at frequencies in the MHz to GHz range, which gives rise to detectable nuclear relaxation. They mostly study intermetallic compounds but methods are applicable to all classes of solids.

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