6533b832fe1ef96bd129ac2c

RESEARCH PRODUCT

<title>Effect of light exposure on dislocation mobility in fullerite C60 crystals</title>

subject

description

The illumination-time evolution and the wavelength dependence of the photoinduced changes in dislocation mobility on the (111) face of C60 single crystals in air for the wavelength range 150 - 900 nm and power densities 0.2 - 2 mW/cm2 has been investigated. The results show that the light exposure in air leads to the decrease of the dislocation mobility. The magnitude of the effect as a function of the illumination time was investigated and a two-stage relationship was obtained. The ultraviolet light was found to be more effective than the visible light in the photoinduced reduction of dislocation mobility and solubility. In the wavelength range of 150 - 700 nm, the reduction of dislocation mobility under light irradiation linearly increased with increasing the photon energy. The obtained results are discussed in terms of the photoinduced polymerization, which proceeds through different stages including the formation of dimers, polymer chains and cross-linked polymerized structures.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.