Thermalization process in photosensitive amorphous molecular semiconductors are theoretically considered from standpoint
of their parameters, namely: thermalization time, thermalization length. The heat electron formed in consequence of
absorption of the light quantum by semiconductor molecules loses his surplus energy in the time of inelastic interaction
with neighbouring atoms. The results of theoretical predictions are confirmed by the experimental ones obtained for a
number ofmolecular semiconductors
Thermalization process in photosensitive amorphous molecular semiconductors are theoretically considered from standpoint
of their parameters, namely: thermalization time, thermalization length. The heat electron formed in consequence
of absorption of the light quantum by semiconductor molecules loses his surplus energy in the time of inelastic interaction
with neighbouring atoms. The results of theoretical predictions are confirmed by the experimental ones obtained for
a number of molecular semiconductors (anthracene, pentacene, PVC, PEPC).
This paper concerns with our measurements of reaction center (RC) volume changes in the course of photoactivation
using method of holographic interferometry. As a principal value, we studed change of a solution refraction index (Δn)
influenced by the sample volume expansion due to temperature changes (ΔnT), light absorption (Δnabs) and changes in the
volume of photoactive molecules (Δnv). Using the scheme of temperature compensation we could reduce the task of the
case ΔnT << Δnabs, Δn Our estimation for the case of a protein solution yields in relative changes in the molecular volume withing 10-3 + 10-2.
The change in an external constant electric field of an electronic absorption coefficient of polymer films, doped by symmetric cationic polymethine dye is researched. This effect are characterised by an increase of intensity on shortwavelength edge of a band and its decrease on long-wavelength edge. The charge distribution in dye cation in model electric field 107 - 108 V/m of point charges and capacitor was calculated by method AMI. On the basis of the quantum chemical calculations the spectral regularities in electric field is interpreted by the change of electronic charge in the cation. The theoretical model based on change of value of eigen frequencies of charged anharmonic oscillators under operation field is offered for the description ofobserved effects. The experimental spectra well correlate with calculated theoretically.
This paper concerns with our measurements of reaction center (RC) volume changes in the course of photoactivation using method of holographic interferometry. As a principal value, we studed change of a solution refraction index (▵n) influenced by the sample volume expansion due to temperature changes (▵nT), light absorption (▵nabs) and changes in the volume of photoactive molecules (▵nV). Using the scheme of temperature compensation we could reduce the task of the case ▵nT<<▵nabs, ▵nV Our estimation for the case of a protein solution yields in relative changes in the molecular volume within 10-3 ÷ 10-2.
This work studies the influence of the electromagnetic radiation of low intesity on the rheologic parameters of water and water solutions of biologically active substance, which plays an important role in energy transforming processes in living organisms. The power spectrum of the thermal fluctuations of the free surface of liquid has been measured using optical heterodyning method which makes it possible to detect the changes in frequency of the light scattered by moving liquid surface. The amplitude, the spectrum of spatial and time frequencies of thermal fluctuations of free surface of a water solution was investigated using optical heteodyning method. The viscosity and the surface tensions in the micro layer of water solution were determined from the obtained results. Water solution was dealt with as a low-viscosity Newtonian liquid in this analysis and was modeled by Navier-Stokes equation and incompressibility equation.
This work studies the influence of the electromagnetic radiation of low intensity on the rheological parameters of water and water solutions of biologically active substance (NADH) which plays an important role in energy transforming processes in living organisms. The power spectrum of the thermal fluctuations of the free surface of liquid (capillary waves spectrum) has been measured using optical heterodyning method which makes it possible to detect the changes in frequency of the light scattered by moving liquid surface. The amplitude, the spectrum of spacial and time frequencies of thermal fluctuations (capillary waves) of free surface of water solution were investigated using optical heterodyning method. The viscosity and the surface tensions in the microlayer of water solution were determined from the obtained results. Water solution was dealt with as a low-viscosity Newtonian liquid in this analysis and was modelled by Navier-Stokes equation and incompressibility equation.
This study is dedicated to theoretical definition of the probability of bound electron-hole pair dissociation (phi) in strong electric fields (E > kT/(beta) , where k is the Boltzman constant, T is the temperature, and (beta) is the Poole-Frenkel constant) in the films of amorphous molecular semiconductors.
The model of current carrier dissociation in the films of amorphous molecular semiconductors which are in strong electric fields has been proposed taking into account the possible hole motion within a Coulomb well by the tunnelling and diffusion drift motion. The probability of this process has also been defined. This study is an attempt to explain the experimentally stated dependencies of the quantum yield of photogeneration on temperature T according to which the extrapolation of the dependencies are crossed at one point To1.
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