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1993 (1)
1990 (1)
1Author    O. Kampe, Ch Frommen, J. PeblerRequires cookie*
 Title    Magnetische Untersuchungen an ACrF4-Verbindungen mit A = K, Rb, Cs 57Fe-Mößbauer-Spektren von CsCrF4 Magnetic Studies o f the Com pounds ACrF4 (A = K, Rb, Cs) A Mössbauer Study o f 57Fe-D oped CsCrF4  
 Abstract    From the results o f magnetic susceptibility and magnetization measurements o f the triple chains ACrF4 (A = K, Rb, Cs), the characteristics o f one-dimensional antiferromagnetic chains are found. The exchange parameters J/k are -6 .2 K and -1 2 .2 K for KCrF4 and CsCrF4, respectively. Measurements on single crystals o f RbCrF4 reveal the exchange and the anisotropy parameters to be J/k = -1 0 .5 K and D /k = 0.4 K. The Mössbauer spectra o f 2% -7Fe doped CsCrF4 show marked relaxation. One third o f the magnetic chains are frustrated and remain uncorrelated with other magnetic chains. 
  Reference    Z. Naturforsch. 48b, 1112—1120 (1993); eingegangen am 25. Februar 1993 
  Published    1993 
  Keywords    Magnetic Frustration, Relaxation Effect, Exchange Energy, Anisotropy, M össbauer Effect 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1112.pdf 
 Identifier    ZNB-1993-48b-1112 
 Volume    48 
2Author    U. Eberl, A. Ogrodnik, M. E. Michel-BeyerleRequires cookie*
 Title    Access to Primary Charge Separation Mechanism in Photosynthetic Reaction Centers: Anisotropic Excitation Spectra of Electric Field Modulated Fluorescence Yields  
 Abstract    Two-step sequential and unistep, superexchange primary electron transfer form primary radical pair states which differ in the direction and magnitude of their dipole moments as revealed in the X-ray structure analysis. The direction can be measured by the excitation anisotropy of electric field induced changes of the fluorescence yield. This method determines angles between the dipole of the primary radical pair and photoselected transition moments (in absorption and emission) of cofactors in the reaction centers. Transitions particularly favourable for discrimination between the two models of primary electron transfer are discussed. 
  Reference    Z. Naturforsch. 45a, 763—770 (1990); received March 17 1990 
  Published    1990 
  Keywords    Electric field effect, Anisotropy, Fluorescence, Photosynthesis, Reaction center, Pri-mary charge separation 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-0763.pdf 
 Identifier    ZNA-1990-45a-0763 
 Volume    45