Nuclear quadrupolar relaxation and the dynamics of pairs of atoms in liquids |
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Authors: | R Brinkmann M Elwenspoek P Maxim D Quitmann |
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Institution: | 1. Institut für Atom- und Festk?rperphysik, Freie Universit?t Berlin, D-1000, Berlin 33, Fed. Rep. Germany
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Abstract: | We have developed a model calculation for the electrical field gradient correlation function on a probe atom in the liquid, cEFG(t)=20(0)V20(t)>. In this model, symmetry of the liquid is introduced explicitly and the distribution function for therelative coordinate ri(t) between the probe atom and particle i is calculated using Smoluchowski's diffusion equation with a mean force potential Φ(r)=kBT In g(r). The results for cEFG(t) can be characterized by two correlation times, , the shorter one being responsible for the small values of RQ in pure liquid metals, the longer one producing the increase of RQ in alloys. Also good agreement is found with recent results for cefg(t) from molecular dynamics studies. |
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