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1997 (1)
1996 (1)
1Author    J. Seliger, V. ŽagarRequires cookie*
 Title    A New Nuclear-Quadrupole Double-Resonance Technique based on Solid Effect  
 Abstract    A new nuclear-quadrupole double-resonance technique is described. It has a higher sensitivity and a higher resolution than the conventional nuclear-quadrupole double-resonance technique based on solid effect. The new technique involves magnetic field cycling between a high and a low static magnetic field and simultaneous application of two //magnetic fields when the sample is in the low static magnetic field. A strong rf magnetic field induces "forbidden" simultaneous transitions in a magnetic (usually 1 H) and in a quadrupole spin system and thus couples the two spin systems. A weak//magnetic field induces transitions between the energy levels of the quadrupole nuclei and simulates a fast spin-lattice relaxation of the quadrupole nuclei when its frequency matches an NQR frequency. The sensitivity and resolution of the new technique are discussed and test measurements in tris-sarcosine calcium chloride are presented. 
  Reference    Z. Naturforsch. 52a, 337—342 (1997); received October 9 1996 
  Published    1997 
  Keywords    NQR, NMR, Double Resonance, Magnetic Field Cycling, Solid Effect 
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 TEI-XML for    default:Reihe_A/52/ZNA-1997-52a-0337.pdf 
 Identifier    ZNA-1997-52a-0337 
 Volume    52 
2Author    K. Konzelmann, G. Majer, A. SeegerRequires cookie*
 Title    Solid Effect Between Quadrupolar Transitions in Dilute Cu-Pd Alloys  
 Abstract    The paper investigates the Dynamic Solid Effect (DSE) in Nuclear Quadrupole Double Reso-nance (NQDOR) on a system (dilute alloys of CuPd with 8, 42, 210, or 1000 at.ppm Pd) chosen for its simplicity and the possibility to test the theoretical concepts on which the experimental tech-niques (in particular the so-called Berthier-Minier technique for exhibiting the DSE) are based. NQDOR allows to observe the transitions between the Cu nuclear energy levels split by the quadrupolar interaction with the electric field gradients generated by nearby Pd atoms even in dilute alloys, in which the fraction of Cu nuclei experiencing a given field gradient is very small. The DSE permits transitions at frequencies corresponding to the sums or differences of quadrupolar level splittings at neighbouring nuclei and thus gives access to information on the spatial correlation of nuclei accessible to NQDOR studies. The DSE information is shown to be in full accord with the conclusions drawn earlier, on the basis of line-intensity arguments, on the assignment of quadrupo-lar transitions to the first four shells of Cu nuclei surrounding isolated Pd atoms but, in addition, allows to identify the low-frequency NQDOR lines associated with Cu nuclei in the fifth and sixth shells. 
  Reference    Z. Naturforsch. 51a, 506—514 (1996); received February 13 1996 
  Published    1996 
  Keywords    Nuclear quadrupole double resonance, Atomic defects in Cu, Electric field gradients, Solid effect 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0506.pdf 
 Identifier    ZNA-1996-51a-0506 
 Volume    51