The fluorescence of 9-cyanoanthracene (9-CNA) crystals analysed in polarized light was found to change under irradiation with the light of mercury lamp. Intensity changes of fluorescence maxima for crystals and powders (microcrystals) are reported. Crystals of 9-CNA examined on the stage of a microscope were found to re-emit light from defects at beginning of irradiation whereas additional emitting centres were created as the irradiation proceeded. The green fluorescence (beginning of irradiation) is now correlated with defects and the blue one (after ≈ 60 min. of irradiation) is thought to be due to monomer in dimer matrix formed under irradiation with a mercury light.
No takes yet. Share an insight, caveat, or question.
Sarti‐Fantoni et al. (1970) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: