75As N.Q.R. and 19F N.M.R. study of solid AsF3 |
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| Authors: | PK Kadaba J Slivnik R Blinc J Pirnat Z Trontelj |
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| Institution: | 1. University of Ljubljana, Institute “J. Stefan” , Ljubljana, Yugoslavia;2. Institute of Mathematics, Physics, and Mechanics, University of Ljubljana , Ljubljana, Yugoslavia |
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| Abstract: | The temperature dependence of the 75As pure quadrupole resonance frequency in AsF3 has been studied from 77 K to a temperature very close to the melting point. It is found that the effective electric field gradient at the As site does not shift much from the gas-phase value and that the temperature dependence of the 75As N.Q.R. frequency seems to follow the Bayer-Kushida model. The occurrence of a line-width transition in the 19F N.M.R. spectrum between 200 and 150 K demonstrates the presence of low-frequency, large-amplitude molecular motions which are too slow to average out the 75As quadrupole coupling. |
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