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'Nitrogen 14' in keywords
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1994 (2)
1Author    U. RmRequires cookie*
 Title    Nitrogen-14 NQR Multiple-Pulse Spin-locking in the Axial Electric Field Gradient  
 Abstract    The behavior of a nuclear spin-1 system with the Hamiltonian including: a) the interaction of the electric quadrupole moment of nuclei with the axial gradient of the crystal electric field; b) a homonuclear and heteronuclear dipole-dipole coupling; and c) the interaction with a multiple pulse radiofrequency field of arbitrary orientation was considered. The effective Hamiltonian is con­ structed by using the Floquet theory. The secular parts of the homonuclear and heteronuclear dipole-dipole interaction was found and the quasi-equilibrium magnetization was calculated. 
  Reference    Z. Naturforsch. 49a, 97 (1994); received September 4 1993 
  Published    1994 
  Keywords    NQR, Multiple-pulse spin-locking, Nitrogen-14 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0097.pdf 
 Identifier    ZNA-1994-49a-0097 
 Volume    49 
2Author    Ulrike Werner-Zwanziger, Marcia Ziegeweid, Bruce Black, Alexander PinesRequires cookie*
 Title    Nitrogen-14 SQ U ID N Q R of L-Ala-L-His and of Serine  
 Abstract    In honor of Professor Dr. Werner Miiller-Warmuth on his 65 th birthday 14N nuclear quadrupole resonance spectroscopy, detected with a Superconducting Quantum Interference Device, makes possible the study of nitrogen environments in amino acids and small peptides. The present experiments characterize: 1) the effects of intermolecular interactions upon the amino nitrogen of serine upon cocrystallization of the stereoisomers in a range of concentrations; 2) the changes of the amino and imidazole nitrogen environments brought about by combining L-Alanine and L-Histidine into the dipeptide L-Ala-L-His. 
  Reference    Z. Naturforsch. 49a, 1188—1192 (1994); received August 22 1994 
  Published    1994 
  Keywords    SQUID, NQR, Amino acids, Nitrogen-14 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1188.pdf 
 Identifier    ZNA-1994-49a-1188 
 Volume    49