Two-photon transitions to highly excited states in anthracene crystals

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Abstract
The two-photon absorption spectrum at room temperature for the creation of singlet excitons and of electron-hole pairs in anthracene crystals has been determined over the two-photon energy range 3.9-5.0 eV. Within a fairly large experimental error, no structure was observed in the wavelength dependence of the two-photon absorption spectrum for the creation of singlet excitons, but the number of electron-hole pairs created increased by more than an order of magnitude between 4.0 and 4.6 eV. The energy dependence of the increase in the number of electron-hole pairs is approximately that expected for transitions to a wide band with an energy gap of about 4.1 eV.

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