CHEMICAL SHIFT, RELAXATION TIME, AND ELECTRIC QUADRUPOLE COUPLING IN ALKALI HALIDES
Chemical shift and spin lattice relaxation times are measured for Cl/sup 35/ in all the alkali chloride crystals and for Br/sup 79/ and I/sup 127/ in some of the halides. These measured values cannot be explained by using only Kondo- Yamashita's theory, which takes into account the effect of overlap between the central ion and the nearest neighbors. For the chemical shift, it seems that the overlap with the second nearest neighbors is an essential cause of the discrepancy and that the covalent and the electrostatic effects are rather small. If these conclusions are admitted, there must be a large chemical shift (about -2 approximates -3 x 10/sup -4/) of chlorine ion in aqueous solution relative to the free chlorine ion. A model combining the electrostatic and the overlap effect is proposed to explain reasonably the relaxation times in the crystals. The electric quadrupole coupling in free molecules of alkali halides is also discussed from the present viewpoint. The combination of the electrostatic and the overlap effects seems to give a reasonable explanation for the observed values. (auth)
- Research Organization:
- Kanazawa Univ., Japan
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-18-012094
- OSTI ID:
- 4119102
- Journal Information:
- J. Phys. Soc. Japan, Journal Name: J. Phys. Soc. Japan Vol. Vol: 19
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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