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'Nuclear quadrupole resonance' in keywords Facet   Publication Year 1996  [X]
Facet   section ZfN Section A:Volume 051  [X]
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1Author    Nicolai Sinyavsky, Michal Ostafin, Mariusz MaćkowiakRequires cookie*
 Title    Rapid Measurement of Nutation NQR Spectra in Powders Using an RF Pulse Train  
 Abstract    The method of two-dimensional nutation NQR spectroscopy, introduced by Harbison in 1989, has been successfully used for determining of the asymmetry parameter of the EFG tensor for spin-3/2 nuclei in both powdered and monocrystal samples in the absence of an external magnetic field. The inconvenience inherent in the method, however, is the long time required, because data acquisition must be repeated for various RF pulse lengths. We discuss a method to reduce the time of the nutation experiment by using a sequence of identical short RF pulses of length r w and distance t. It is shown that for an NQR frequency co 0 , frequency offset Aco, and pulse parameters satisfying the relation co 0 1 -I-Aco t w = 2 n k (k = 1, 2, 3,..., n) a synchronism of pulse action takes place and the nutation interferogram can be measured "stroboscopically" between the pulses. The maximum time saving factor that can be obtained as compared to the conventional nutation experiment is of the order of the number of pulses used in a pulse train. The method has been successfully applied for determination of the asymmetry parameter for one of the two 35 C1 sites in polycrystalline 2,4,6-trichloro-l,3,5-triazine (cyanuric chloride). 
  Reference    Z. Naturforsch. 51a, 363—367 (1996); received February 13 1996 
  Published    1996 
  Keywords    Nuclear quadrupole resonance, Two-dimensional nutation spectroscopy, Asymmetry parameter 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0363.pdf 
 Identifier    ZNA-1996-51a-0363 
 Volume    51