Thermal broadening of infrared energy levels of UCl5 single crystal

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Abstract
The thermal behavior of the linewidths of the infrared energy levels of UCl5 single crystal is explained by multiphonon processes. Processes involving more than five phonons are associated with the highest-energy phonons of the lattice. For lower order processes, lower-energy phonons can be important. In the calculations, the vibronic sidebands of the electronic levels provide a guide in choosing which phonons are to be involved in the relaxation processes. The measurements also show large spin–spin interactions between the uranium ions.

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