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'Relaxation time' in keywords
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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    Heinrich NöthRequires cookie*
 Title    Lithium-tetrahydroaluminat in Ether: eine NMR-Untersuchung Lithiumtetrahydroaluminate in Ether: an NMR Study  
 Abstract    Ether solutions of LiAlH4 have been investigated by 27 Al and 7 Li magnetic resonance in the concentration range 3.75-0.0075 M. The Al-signal shows a fine structure due to Al-H coupling only at concentrations below 0.15 M. The observed chemical shift 27 Al is only slightly concentration dependent. The line width of the 27 A1 signal, which is inversely proportional to T2*, reaches a minimum value at a concentration where the best resolution of the 27 A1 quintet is observed. This, however, is not matched by the 7 Li line width whose minimum value was found at a somewhat higher concentration. The results are consistent with multiple ion formation at the higher concentrations and with an ion pair at low concentrations. 
  Reference    (Z. Naturforsch. 35b, 119—124 [1980]; eingegangen am 7. November 1979) 
  Published    1980 
  Keywords    7 Li NMR, 27 A1 NMR, Relaxation Times, Lithiumtetrahydroaluminate 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0119.pdf 
 Identifier    ZNB-1980-35b-0119 
 Volume    35 
3Author    Masao Hashimoto, Takahiro Isono, Haruo Niki, Takuya HigaRequires cookie*
 Title    Fade-Out of 35 C1 NQR in Chloral n-Butylhemiacetal  
 Abstract    Continuous wave and pulsed NQR, dielectric absorption and infrared (IR) measurements were carried out to investigate the origin of the peculiar temperature dependence of the S/N ratio of the 35 C1 NQR in the title compound. The dielectric and IR experiments evidenced a thermally activated jumping motion of the H atom participating in O-H O H-bonds. As T x and T 2 below 120 K were much longer than T 2 * of about 10 us, the line broadening in this temperature region was attributed to static lattice defects. A random freezing of the jumping motion may be the origin of the defects. In the range 120-170 K, S/N was extremely low and T 2 was less than 10 |is, probably having a minimum in between. The short T 2 is considered to be responsible for the low S/N. A minimum of S/N at about 240 K is attributed to a 7\ minimum (less than 10 (is) at that temperature. 
  Reference    Z. Naturforsch. 45a, 472—476 (1990); received August 26 1989 in revised form December 1 1989 
  Published    1990 
  Keywords    NQR, Relaxation times, Hydrogen bond, Dielectric absorption, Disordered structure 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-0472.pdf 
 Identifier    ZNA-1990-45a-0472 
 Volume    45 
4Author    J. Jadżyn, G. Czechowski, B. Żywucki, C. Legrand, P. Bonnet, R. DąbrowskiRequires cookie*
 Title    Dielectric Properties of Mesomorphic n-TPEB's in Isotropic Phase  
 Abstract    Dielectric relaxation studies have been performed for the isotropic phase of a series of mesogenic molecules of l-[3-n-alkyl-biphenyl]-2-[4-isothiocyanatophenyl]ethane, CnH 2n+ 1 -(f)-(t>-CH 2 CH 2 -<p-NCS (n-TPEB), for n = 7, 8 and 9. Two Debye-type dielectric absorption bands have been interpreted as corresponding to the rotation around the short and long molecular axis. 
  Reference    Z. Naturforsch. 48a, 871—874 (1993); received May 29 1993 
  Published    1993 
  Keywords    Dielectric relaxation, Molecular dynamics, Mesomorphic molecules, Relaxation time, Activation energy 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0871.pdf 
 Identifier    ZNA-1993-48a-0871 
 Volume    48