LIGHT-INDUCED ELECTRON-SPIN-RESONANCE IN POLYANILINE

Light induced electron spin resonance (LESR) is reported for members of the polyaniline family of polymers. The LESR is composed of a single line at g approximately 2 whose width and intensity are dependent on the time of exposure and temperature. The LESR line intensity shows a very long growth and decay time that can be fit to a Kohlrausch stretched exponential type law with coefficients that follow a Vogal-Fulcher law. There is a direct dependence of the linewidth of the photo-induced spins on the concentration of induced spins suggesting a strong interaction between induced defects and leading to the postulation of a phase segregation of defect.