Abstract
The photoacoustic spectra of naphthalene in powder form and in boric acid glass are reported in the region 250–400 nm. They show additional bands on the higher-wavelength side when compared with the conventional electronic absorption spectra. The CNDO/S-CI method is used to calculate the electronic transitions of the naphthalene molecule with the optimized geometries. On the basis of these calculations, the additional bands observed on the higher-wavelength side are attributed to singlet—triplet absorptions. Good agreement is found between the experimental and calculated results.
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