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1
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Non-Exponential Decays in First-Order Kinetic Processes. The Case of"Squeezed Exponential"

100%
Sworakowski J., Matczyszyn K.
Acta Physica Polonica A
|
2007
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vol. 112
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issue S
S-153-S-159
EN
Kinetics of processes, in which the reaction rate increases with conversion, is discussed and illustrated with an example of the chemical reaction of isomerization of an azobenzene derivative in a liquid crystalline matrix. A simple phenomenological model is put forward explaining the effect by dynamic changes of interactions between the reacting species and the matrix.
2
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Trapping of Charge Carriers in Organic Molecular Materials: Phthalocyanine Thin Films Revisited

81%
Zhivkov I., Nešpurek S., Sworakowski J.
Acta Physica Polonica A
|
2001
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vol. 100
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issue Supplement
215-228
EN
The technique of temperature-modulated space-charge-limited currents was employed to study the energetic distribution of local states in thin films of metal-free phthalocyanine. Four well-defined local levels were detected within the energy range 0.5-0.3 eV, accompanied by an onset to a manifold of shallower states. The morphology of the films, depending on the deposition rate and changing from polycrystalline to nearly amorphous, affects the densities of local states but not their energies.
3
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Dielectric Study of Pure Polymer and Mixed Monomer-Polymer Single Crystals of pTS Diacetylene: a Comparison with Neutron Scattering Results

71%
Longevile S., Even J., Bertault M., Kołodziej H. A., Sworakowski J.
Acta Physica Polonica A
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1995
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vol. 88
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issue 2
359-367
EN
Temperature and frequency dependences of the electric permittivity in mixed monomer-polymer single crystals of the diacetylene pTS (2,4-hexadiynylene bis(p-toluenesulphonate)) are reported. The dependences were determined in the temperature range 100-250 K, and in the frequency range 100 Hz - 1 MHz. Two types of single crystals were studied: nearly-fully polymerized ones, and those containing ca. 20% of polymer in the monomer matrix. The dynamics is characterized by a high-frequency response (v ≫ 3 GHz) which corresponds to the soft mode analysed previously by the Raman and neutron inelastic scatterings. At low frequencies (v ≤ 1 kHz), another component is observed, its dielectric intensity peaking around the transition temperature in the fully polymerized crystals. The results are consistent with the results obtained from NMR and neutron scattering experiments.
4
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Solvatochromic Effect in a Benzimidazole-Based Betaine: Determination of the Dipole Moments and Second-Order Hyperpolarizability

61%
Ziółek L., Palewska K., Lipiński J., Sworakowski J., Nes̆půrek S., Böhm S., Meister E. C.
Acta Physica Polonica A
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1995
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vol. 88
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issue 2
283-293
EN
Results of measurements of the solvent-dependent shift of the low-energy absorption band solvatochromic effect in a benzimidazole-based betaine are reported in the paper. Measurements of absorption spectra in several solvents of different polarities were performed. The solvatochromic shift of the low-lying absorption band was found to exceed 3000 cm^{-1}; the results obtained were then employed to calculate the ground- and excited-state dipole moment of the molecule. The spectroscopic measurements were supplemented by measurements of the ground-state dipole moment. A remarkable change in the charge distribution was found to occur upon the electronic excitation: both the experimental results and the calculations indicate that the ground-state dipole moment is close to 13 D, whereas in the excited state it amounts to ca. 3 D. The second-order hyperpolarizability of the molecule was calculated from the measurements; its off-resonance value amounts to ca. 20 × 10^{-40} m^{4}/V (4.8 × 10^{-30} esu), depending on the solvent used.
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