The structure of colour centers in photochromic glass

摘要: Abstract An ellipsoidal model of colour centers in photochromic glass was proposed to explain an additional absorption spectrum. Absorption spectra small ( R ⪅ 100 A ) involving oblong and oblate ellipsoids rotation have been analysed. The splitting the spectrum silver particles with non-spherical form resulted different from that for spherical particles. Calculation system considerable dispersion eccentricity about 20 size good agreement experiment. differed significantly experimental findings, indicating were absent. To verify basic theory center model, advanced experiments carried out on bleaching by monochromatic polarized light. so called photo-adaptation effect has found, is, decreased faster at wavelength spectral width indicated particle nearly A. ratio changing perpendicular parallel orientations reading polarization vectors 0.7 longwave visable range, substantially anisotropic. In thermal recovery shortwave absorptions bleached faster, lower stability strong particles, which specifies those parts