Zeeman Effect on the Quadrupole Spectrum of Iodic Acid

Abstract

The pure quadrupole spectrum of I127 in iodic acid has been observed at several temperatures. At 22°C the z component of the quadrupole coupling is 1126.9 Mc and η, the asymmetry parameter is 0.4505. Zeeman studies on the low frequency transition (±1/2→±3/2) showed an intensity effect that depended on the orientation of the crystal in the rf coil. Extra Zeeman components were present that resulted from a proton interaction, and the study of these essentially located the hydrogen in the crystal lattice. Zeeman studies on the high frequency transition (±3/2→±5/2) showed four components for each type of iodine atom, the two not normally present unless η is large were weak. The splittings of the levels were uniquely assigned and the directions of the principal axes computed.

Correlation between Structural, Infrared and Nuclear Quadrupole Resonance Data of Iodates

“…After two papers with incorrect data on NQR of I 2 O s [1,2], numerous papers on various classes of iodates were stimulated by three papers on iodine-127 NQR of a-HI0 3 [3][4][5], Based on NQR data, Herlach [6] indicated that none of the alkaline metal iodates have a perovskite structure, as was confirmed by further structural studies on iodates. At present we know the structure, infrared spectra and NQR of (i) simple iodates of metals having various valencies (ii) complicated iodates whose chromatoiodate CrI0 6 type heteroions represent Cr0 4 tetrahedra which are connected with the I0 3 group via oxygen bridges, (iii) complex iodates M'M IV (I0 3 ) 6 , where M 1 is an alkaline metal, NH 4 or H, and M 1V is Sn, Ge, Ti, Zr, Pb or Mn, (iv) acid iodates that contain the HIO a group, and (v) pyroiodates that contain the groups I 2 0 5 and I0 3 .…”

“…At present we know the structure, infrared spectra and NQR of (i) simple iodates of metals having various valencies (ii) complicated iodates whose chromatoiodate CrI0 6 type heteroions represent Cr0 4 tetrahedra which are connected with the I0 3 group via oxygen bridges, (iii) complex iodates M'M IV (I0 3 ) 6 , where M 1 is an alkaline metal, NH 4 or H, and M 1V is Sn, Ge, Ti, Zr, Pb or Mn, (iv) acid iodates that contain the HIO a group, and (v) pyroiodates that contain the groups I 2 0 5 and I0 3 . We shall consider the peculiarities of these crystals and their correlation with NQR data (Table 1) and IR spectra, and then we shall discuss based on their NQR data, the peculiarities of the structures of several iodates with organic cations.…”