Knowledge Bank

“A Cary Model 14 Spectophotometer has been modified to permit recording the absorption spectra of materials while they are being irradiated with light from an AH6-mercury are. Using rods of plastic containing dissolved aromatic $compounds1$, triplet-triplet absorption spectra have been recorded for naphthalene, anthracene, chrysene, coronene and several other aromatic hydrocarbons. In some cases the corresponding depletion of the ground absorption is also detectable, which makes it possible to calculate the extinction coefficient of the triplet-triplet transition.”