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'Electric field effect' in keywords Facet   section ZfN Section A  [X]
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1992 (1)
1990 (1)
1Author    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 
2Author    HaeJin Kim, KeeTae Han, SungHo ChohRequires cookie*
 Title    Electric Field Effect on 14 N NQR in Ferroelectric Thiourea Single Crystals ** *  
 Abstract    The electric field effect on 14 N NQR in ferroelectric thiourea [SC(NH2)2] single crystals has been investigated at 77 K up to a field of 10 kV/cm. The measured Stark shifts are, in units of kHz • cm/ kV, dvj h /d£+ = 0.87±0.10, dvx + /d£_ = 1.17±0.20, dv2 + /d£+ = 0.80±0.10, and dv2 + /d£_ = 0.90 ±0.15. These values are on the order of 10 2 times those found in other ferroelectric crystals such as sodium nitrite (NaN02). The remarkable difference between these two Stark shifts is discussed by taking into account the polarizability and the local electric field at the 14 N sites in these crystals. 
  Reference    Z. Naturforsch. 47a, 227—231 (1992); received August 4 1991 
  Published    1992 
  Keywords    Electric field effect, Stark shift, 14 N NQR, Ferroelectric thiourea, Thiourea single crystal 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0227.pdf 
 Identifier    ZNA-1992-47a-0227 
 Volume    47