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1Author    Noriaki Okubo, Mutsuo Igarashi3Requires cookie*
 Title    Relaxation of 121Sb NQR in Antimony Trichloride due to Raman Process  
 Abstract    The spin-lattice relaxation times of 121Sb nuclear quadrupole resonance in SbCl3 have been measured from 4.2 K to the m. p., 346 K. The result is analyzed with a theory of the Raman process based on co­ valency and discussed in comparison with the previous result for Cl nuclei. 
  Reference    Z. Naturforsch. 56a, 777 (2001); received August 21 2001 
  Published    2001 
  Keywords    SbCl3, 121Sb-NQR, Relaxation Times, Raman Process, Covalency 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0777.pdf 
 Identifier    ZNA-2001-56a-0777 
 Volume    56 
2Author    Noriaki Okubo, Yoshihito AbeRequires cookie*
 Title    35C1 Nuclear Quadrupole Relaxation in Antimony Trichloride  
 Abstract    The 35C1 NQR frequency and spin-lattice relaxation time in SbCl3 have been measured between 10 K and the melting point. The relaxation at low temperatures is attributed to the Raman process. A Debye temperature of 141 K and covalencies 0.390 and 0.356 are obtained. The latter values correspond well to those obtained from the NQR frequencies. For the relaxation above 200 K two more mechanisms are considered. 
  Reference    Z. Naturforsch. 49a, 680—686 (1994); received March 14 1994 
  Published    1994 
  Keywords    Antimony trichloride, Nuclear quadrupole relaxation, Raman process, Debye temper­ ature, Covalency 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0680.pdf 
 Identifier    ZNA-1994-49a-0680 
 Volume    49 
3Author    Noriaki Okubo, Mutsuo Igarashi, Ryozo YoshizakiRequires cookie*
 Title      
 Abstract    The 81 Br nuclear spin-lattice relaxation time in AlBr3 has been measured between 8 K and room temperature. The result is analyzed using the theory of the Raman process based on covalency. A Debye temperature of 67.6 K and covalency of0.070 and 0.072 for terminal and 0.022 for bridging bonds are obtained. The correspondence of the latter values to those obtained from the NQR frequencies is low, in contrast to the previously examined compounds. 81 B r N u c le a r Q u a d r u p o le R e la x a tio n in A lu m in iu m T rib ro m id e 
  Reference    Z. Naturforsch. 50a, 737—741 (1995); received February 20 1995 
  Published    1995 
  Keywords    Aluminium tribromide, Nuclear quadrupole relaxation, Raman process, Debye temper­ ature, Covalency 
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 TEI-XML for    default:Reihe_A/50/ZNA-1995-50a-0737.pdf 
 Identifier    ZNA-1995-50a-0737 
 Volume    50 
4Author    Noriaki Okubo, Mutsuo Igarashi, Ryozo YoshizakiRequires cookie*
 Title    Relaxation of 2 7 AI NMR in Aluminium Tribromide due to Raman Process  
 Abstract    The nuclear spin-lattice relaxation of 27 A1 NMR in AlBr 3 has been examined from 25 to 320 K. The result is analyzed using a theory of the Raman process based on covalency. A Debye temper-ature of 118 K is obtained together with a covalency larger than that obtained from the relaxation in the 81 Br NQR. 
  Reference    Z. Naturforsch. 51a, 277—282 (1996); received November 15 1995 
  Published    1996 
  Keywords    Aluminium tribromide, 27 A1 NMR, Nuclear quadrupole relaxation, Raman process, Covalency 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0277.pdf 
 Identifier    ZNA-1996-51a-0277 
 Volume    51 
5Author    Mutsuo Igarashi, Noriaki Okubo, Shuichi Hashimoto, Ryozo Yoshizaki, DeokJoon ChaRequires cookie*
 Title    Na Spin-Lattice Relaxation Measurements in Dehydrated Na-X Zeolite  
 Abstract    The spin-lattice relaxation time T\ of 23 Na-NMR in a dehydrated Na-X zeolite has been measured from 20 to 300 K. The recovery curve is not single-exponential at all measured temperatures and T\~ 1 increases with the square of temperature around room temperature. The results are analyzed by assuming non-equivalent sites and by applying the theory of the Raman process based on covalency. 
  Reference    Z. Naturforsch. 51a, 657—661 (1996); received October 17 1995 
  Published    1996 
  Keywords    Dehydrated Na-X zeolite, 23 Na-NMR, spin-lattice relaxation, Raman process, nonequivalent sites 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0657.pdf 
 Identifier    ZNA-1996-51a-0657 
 Volume    51 
6Author    Noriaki Okubo, Harutaka Sekiya, Chiaki Ishikawa, Yoshihito AbeRequires cookie*
 Title    Br Nuclear Quadrupole Relaxation in the High Temperature Modification of Niobium Pentabromide  
 Abstract    The spin-lattice relaxation time of 79 Br NQR has been measured between 4.2 K and room temperature. The result is compared with that of 35 C1 NQR in NbCl 5 . The origin of the relaxation is attributed to the quadrupolar interaction and the temperature dependence is explained by the Raman process. The Debye temperature is determined to be 94 K and the relaxation time is related with the NQR frequency through the covalency. 
  Reference    Z. Naturforsch. 47a, 713—720 (1992); received December 13 1991 
  Published    1992 
  Keywords    Niobium pentabromide, Nuclear quadrupole resonance, Spin-lattice relaxation, Raman process, Debye temperature 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0713.pdf 
 Identifier    ZNA-1992-47a-0713 
 Volume    47