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1994 (1)
1Author    N. F. Peirson, J.A S Smith, D. StephensonRequires cookie*
 Title    70 Quadrupole Dips in Ammonium Persulphate  
 Abstract    The magnetic field dependence of the *H spin-lattice relaxation time in ammonium persulphate shows pronounced minima near the JH magnetic resonance frequencies of 1,200 and 2,200 kHz. These are interpreted in terms of a m odel involving cross-relaxation between *H in the N H 4 ion and 170 in natural abundance in the S2O g_ ions, the latter having a much shorter spin-lattice relaxation time. A theoretical analysis of the shape of the minima is used to derive values for the 170 quadrupole parameters. This analysis results in best estimate values for the quadrupole coupling constant of 6.75 (± 0.05) M Hz and an asymmetry of 0.30 (± 0.02). Such values are indicative o f O -H hydrogen bonding and suggest the S2O g _ ion is not undergoing rapid reorientation at temperatures below 320 K. 
  Reference    Z. Naturforsch. 49a, 345 (1994); received August 16 1993 
  Published    1994 
  Keywords    N M R, N Q R, Field cycling, Oxygen-17 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0345.pdf 
 Identifier    ZNA-1994-49a-0345 
 Volume    49