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1Author    David Stephenson, JohnA S Smith, St Augustine, Tobago TrinidadRequires cookie*
 Title    Low Frequency NQR using Double Contact Cross-relaxation  
 Abstract    A cross-relaxation technique is described which involves two spin contacts per double reso-nance cycle. The result is an improvement in signal to noise ratio particularly at low frequencies. Experimental spectra and analyses are presented: 14 N in ammonium sulphate showing that the tech-nique gives essentially the same information as previous studies; 14 N in ammonium dichromate determining e 2 Qq/h as (76±3) kHz and r} = 0.84±.04; 7 Li in lithium acetylacetonate for which the spectrum (corrected for Zeeman distortion) yields e~Qq/h = (152 ±5) kHz and r\ -.5 ±.2. Calculated spectra are presented to demonstrate the r\ dependence of the line shapes for 7 Li. 
  Reference    Z. Naturforsch. 55a, 37—10 (2000); received September 11 1999 
  Published    2000 
  Keywords    NQR, l4 N, 7 Li, Low Frequency, Double Resonance 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0037.pdf 
 Identifier    ZNA-2000-55a-0037 
 Volume    55