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1998 (1)
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1Author    G. B. Furman, I. M. KadzhayaRequires cookie*
 Title    Zeeman Effect of Pure NQR in a Rotating Frame (CW and Pulsed Excitation)  
 Abstract    The Zeeman effect in a rotating frame is considered for the case when the quadrupolar nuclear spin system is acted on by two radio-frequency fields. 
  Reference    Z. Naturforsch. 47a, 412—414 (1992); received November 21 1991 
  Published    1992 
  Keywords    NQR, Zeeman effect, Radio-frequency field Rotating frame 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0412.pdf 
 Identifier    ZNA-1992-47a-0412 
 Volume    47 
2Author    David Stephenson, JohnA S SmithRequires cookie*
 Title    The Zeeman Effect in Quadrupole Double Resonance Spectra: Dependence of the Line Shapes on the Orientation of the Electric Field Gradient Tensor  
 Abstract    The solid effect spectrum of 1,4-dichlorobenzene was recorded at magnetic field strengths in excess of 50 G; at these field strengths Zeeman structure is seen on the 35C1 resonance. Unlike in single resonance experiments, peaks are asymmetric, and the high frequency and low frequency solid effect peaks have not the same shape. Computer calculation o f the solid effect spectrum gives peaks which show the same asymmetry as the experimental spectrum. The simulated line shapes are found to depend on the direction the principal com ponents o f the electric field gradient in the crystal framework and indicate that qyy lies in the plane o f the benzene ring. 
  Reference    Z. Naturforsch. 49a, 351 (1994); received July 23 1993 
  Published    1994 
  Keywords    35C1 quadrupole resonance, Zeeman effect, D ouble resonance, Electric field gradient 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0351.pdf 
 Identifier    ZNA-1994-49a-0351 
 Volume    49 
3Author    O. Ege, S. Nishijima, E. Kimura, H. Akiyama, S. Hamai, H. NegitaRequires cookie*
 Title    Powder Zeeman NQR Study on the Absorption Forms for Nuclear Spin 5/2  
 Abstract    For nuclei which have a nuclear spin of 5/2 and exhibit a small asymmetry parameter of the electric field gradient (77) at the nuclear site, line shapes of the Powder Zeeman NQR (PZNQR) spectra based on the transition between the energy levels m x = ± 1/2 and ± 3/2 (the lower frequency line) were stud-ied by means of computer simulations and experiments, (i) When an 77 value is very small (type 1; 77 = 0), the line shape exhibits two shoulders like the style of the American football player, (ii) While an 77 value is small (type 2; 0< 77 < around 0.01) but not zero, the line shape has two small peaks which are symmetrically located on the shoulders, as in the case of the small 77 type of spin 3/2. (iii) When an 77 value is not small (type 3; around 0.01 <77), the line shape has two symmetrical dips in stead of the peaks, which are also similar to the case of not small 77 type of spin 3/2. As the 77 value increases from around 0.01, the two dips grow and reach the maximum at the 77 value of 0.349, and then become small-er and obscure in the range of 77 larger than 0.349. __ The observations of PZNQR spectra were performed for several compounds including the ,27 I and/or 12 'Sb nuclei to estimate the 77 values, and gave the results as follows: very small for I (207.683 and 209.133 MHz, at 77 K) in Snl 4 ; very small for 127 I (176.496 and 177.438 MHz, at 77 K) in Gal 3 ; small for 127 I (265.102 MHz, at 77 K) in CH 3 I; 0.33 for 127 I (247.69 MHz, at 77 K) in C 2 H 5 I; 0.27 for 121 Sb (58.23 MHz, at 290 K) in SbCl 3 . The estimated 77 values were compared to those obtained from the fre-quencies of two NQR lines for spin 5/2. They were in good agreement with each other for the small re-gion of 77, though somewhat large disagreements were seen in the cases of not small 77 values. 
  Reference    Z. Naturforsch. 53a, 314—317 (1998); received March 24 1998 
  Published    1998 
  Keywords    NQR, Nuclear Quadrupole Resonance, Zeeman effect, Powder Zeeman NQR, Spin 5/2 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0314.pdf 
 Identifier    ZNA-1998-53a-0314 
 Volume    53