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'Quadrupole effect' in keywords Facet   Publication Year 1994  [X]
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1Author    PascalP M AnRequires cookie*
 Title    Solomon Echoes Extended to Soft Pulse Excitation  
 Abstract    Solomon echoes, produced by two in-phase pulses separated by a delay r2, are derived in taking into account the first-order quadrupolar interaction during the pulses. Consequently, the results are valid for any ratio of the quadrupolar coupling, coQ, to the amplitude of the radiofrequency pulse, <yRF. Six echoes are predicted after the second pulse: three, detected as inner satellite signals, occur at t 4 = r2, t 4 = 2 t 2 and t 4 = 3 1 2; the other three, detected as outer satellite signals, occur at t 4 = r 2 /2, t 4 = t 2 , and t4 = 3 t 2 /2. These echoes originate from the refocusing of single-and multi-quantum off-resonance coherences developed during the first pulse. Four of them are allowed echoes, the other two are forbidden ones. However, there is no echo for the central transition. From a practical point of view this means that r2 must be short compared to TFID, the duration of the FID of the central transition. The behavior of the echo amplitude versus the second pulse length is discussed for several ratios of coQ/coRF. 
  Reference    Z. Naturforsch. 49a, 89 (1994); received July 23 1993 
  Published    1994 
  Keywords    Quadrupole effect, Spin-5/2, Spin echo NM R, Solomon echoes 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0089.pdf 
 Identifier    ZNA-1994-49a-0089 
 Volume    49