Off Center Ions
Mostrando 1-4 de 4 artigos, teses e dissertações.
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1. Espectroscopia e transferÃncia de energia em eidros La2O3-Nb2O5-B2O3
Glasses are amorphous materials with structures that can, in general, be described by a random non-periodic network model. Although for many glasses, mainly silicates, this model is appropriate, there are systems that present short and medium-range order (first and second coordination spheres) for which more sophisticated models are needed to describe their
Publicado em: 2003
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2. Comportamento de íons fora de centro em halogenetos alcalinos / Behaviour of off-center ions in alkali halides
Experimental results are given on the off-center behavior of Cu+ ion in RbCl, RbBr, Hbl, NaI and in mixed crystals of KI+%KCl and KCl+%KI, as also on Ag+ in RbI. We use UV optical absorption, ionic thermal current (ITC) and uniaxial stress induced dichroism techniques. It is studied the temperature dependence of the oscillator strength, the relaxation time a
Publicado em: 1978
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3. Study on Cu+ off- center dipoles in potassium halides / Estudos sobre dipolos fora de centro de Ions de CU+ em halogenetos alcalinos.
Theoretical and experimental investigations have concluded that Cu+ occupies an off-canter position in several alkali halides. In this work we report results obtained by ionic thermal-currents technique (ITC) to verify the electric dipole properties due to Cu+ ions in off-center position in KC1 crystals. This was developed to study the Cu+ ion behaviour in K
Publicado em: 1973
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4. Glutamate and 2-amino-4-phosphonobutyrate evoke an increase in potassium conductance in retinal bipolar cells.
Although there is general agreement that L-glutamate can produce a depolarizing inward current to account for the hyperpolarizing (OFF) bipolar cell response, the conductance mechanism underlying the depolarizing (ON) response has been difficult to establish satisfactorily. To investigate the ionic bases of the center responses, we studied the whole-cell cur