127I NQR in some iodic acid compunds

Abstract

A b s t r a~t -~~~I NQR frequencies have been measured in 20 compounds including iodates, chromate-iodates and tri-iodates. Quadrupole coupling constants and asymmetry parameters have been calculated at 77°K. Lines have been assigned by the twofrequency method. NQR data show the presence of covalent bonds in iodates and tri-iodates. In chromate-iodates the large value of the asymmetry parameter is due to the non-equivalence of an oxygen atom in the I 0 , -ion. .