Photostimulated Changes Research Articles

The studies of the effect of photostimulated changes in thin carbon films

Photostimulated changes in thin carbon films deposited onto fused silica substrates by reactive magnetron sputtering and irradiated by the light of the first (1060nm) and the second (530nm) harmonics of a QW-switched Nd3+ AVG laser were investigated. The changes are supposed to be connected with the reordering of chemical bounds.

On the nature of irreversible photo and thermoinduced changes in evaporated a-AsxS1−x layers

The photo- and thermally induced changes in the dissolution rate of a-AsxS1−x and Ag/AsxS1−x evaporated layers are followed at different temperatures and As contents (x). The activation energy for thermoinduced changes as dependent on x coincides with that of the kinematic viscosity suggesting a similar mechanism. The activation energies for photostimulated changes coincide with the activation energies of changes in the intensity of Raman spectra of AsS3 and S2AsAsS2. Comparison of the activation energies for photoinduced relaxation with the dissolution rate and the sensitivity as dependent on x shows that AsS3 structures are responsible for the photostructural changes. The photostructural changes in AsxS1−x are the rate determining factor during the photodoping with Ag.

Forced Rayleigh Scattering in nCB's (n=5-9) with Methyl Red and Binary Mass Diffusion Constants

Binary mass diffusion constants of methyl red in nCB's (n=5-9) were measured by forced Rayleigh scattering. It was found that the diffusion constants in nCB's with odd carbon atoms in the alkyl chain are larger than those with even ones. This odd-even effect could be explained by the molecular structural anisotropy, which is mainly governed by the alkyl chain length. The origin of the transient grating in liquid crystalline phases is attributed to the periodic structure of an order parameter. An anomalous increase in the diffraction efficiency was observed as the phase-transition temperature was approached. This phenomenon could be interpreted as a photostimulated change in the phase transition temperature proposed by Odulov et al.

Photostimulated changes of optical properties and structure of amorphous SeAs films

Photostimulated changes of optical properties and structure of amorphous SeAs films