Two-photon spectroscopy of dipole-forbidden transitions. The low-lying singlet states of anthracene

Abstract

The 2-photon excitation spectrum of anthracene in soln. from 29,000 to 47,000 cm-1 is reported. Two-photon allowed transitions to 1B3g(35,800 cm-1), 2Ag (38,000 cm-1), and 3Ag (43,000 cm-1) were assigned by polarization measurements. These results, with those from 1-photon spectroscopy, agree with calcns. Theor. data suggest assignment of a B3g state to a shoulder at 39,000 cm-1 in the 2-photon spectrum.