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2000 (1)
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1Author    L. Ya, E. W. Baranov, SchlagRequires cookie*
 Title    New Mechanism for Facile Charge Transport in Polypeptides  
 Abstract    An electronic hole migration accross a polypeptide chain is discussed with special reference to new ab initio computational results and to the experimental observations of Weinkauf et al. on the charge photoinjection into the polypeptide backbone. New mechanistic details for this efficient charge transport process are proposed. The process is viewed as a vibronically induced hole hopping between local aminoacid sites driven by large amplitude torsional motions of the floppy backbone. 
  Reference    Z. Naturforsch. 54a, 387—396 (1999); received May 7 1999 
  Published    1999 
  Keywords    Protein, Polypeptide, Charge Transfer, Hopping 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0387.pdf 
 Identifier    ZNA-1999-54a-0387 
 Volume    54 
2Author    J. Heldt, J. R. Heldt, T. Redzimski, H. Diehl, P. SchultzRequires cookie*
 Title    Spectroscopic Studies of Dimethylamino Derivatives of Fluorene  
 Abstract    2-dimethylamino-9-fluorenol and 2-dimethylamino-9(4'dimethylamino)phenyl-9-fiuorenol in polar solvents in the excited state undergo conformation changes in which two fluorescent isomers are created. The isomers (in the local excited (LE) and charge transfer (CT) configuration) pos-sess separate fluorescence bands, one appearing from the S! (LE) state and the second from the intramolecular charge transfer state S, (CT) of the neutral, aromatic molecule. Both bands show a solvatochromic effect. Using the method of the solvent induced Stokes shift of the absorption and fluorescence spectra the permanent dipole moment of the excited state of fluorene and its two derivatives have been determined. The dipole moment of the ground state and the Onsager cavity radius of the studied molecules were calculated with the Auestion Model 1 (AMI) program. 
  Reference    Z. Naturforsch. 55a, 902—908 (2000); received October 31 2000 
  Published    2000 
  Keywords    Isomer, Dual Fluoescence, Solvatochromic Effect, Charge Transfer 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0902.pdf 
 Identifier    ZNA-2000-55a-0902 
 Volume    55 
3Author    M. Jánossy, P. MezeiRequires cookie*
 Title    Excitation of the 210 nm Zn II Line in a Hollow Cathode He-Ne-Zn Discharge  
 Abstract    In a hollow cathode He-Zn discharge it was observed that addition of Ne stops laser oscillation at the 492.4 nm Zn II line and increases significantly the spontaneous intensity at the 210 nm Zn II line, which originates from the 4d 2 D 5/2 lower level of the laser transition. Based on a rate equation model, the cross-section of the Ne ion-Zn atom charge transfer collisions populating the 4d 2 D 5/2 level was determined. The cross-section 3.5x 10 -15 cm 2 found by us is in acceptable agreement with the value 2.3x 10" 15 cm 2 reported in the literature. This high cross-section together with existing lower level depopulation points to the possibility of obtaining laser oscillation at 210 nm in a Ne-Zn discharge. 
  Reference    Z. Naturforsch. 53a, 955—959 (1998); received April 6 1998 
  Published    1998 
  Keywords    Gas Lasers, Laser Excitation, Charge Transfer, Glow Discharges, Sputtering 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0955.pdf 
 Identifier    ZNA-1998-53a-0955 
 Volume    53