HYPERFINE INTERACTION IN HG-199-201+ (6S(1)) - ELECTRON-PARAMAGNETIC-RESONANCE STUDIES OF HG+ IN NH4CL SINGLE-CRYSTALS( AND HG)

The mercurous ion Hg+ is produced by gamma irradiation of Hg2+-doped a mmonium chloride single crystals, and electron paramagnetic resonance studies of it have been conducted in the 10-300 K temperature range. I t is shown that He occurs substitutionally at the NH4+ site. For odd i sotopes of mercury, Hg-199 and Hg-201, hitherto unreported transitions have been observed and are found to be highly sensitive to variations in the hyperfine coupling constant A, and thereby to the temperature dependence of A. The temperature dependence of A (for odd isotopic spe cies) has shown an anomalous increase below the lambda transition of a mmonium chloride. The observation of new transitions has enabled the h yperfine coupling constants to be determined accurately and also the h yperfine anomaly for Hg-199+ and Hg-201+ to be re-estimated.