Abstract
The low-energy system in the polarized two-photon excitation spectrum of carbazole at 4.2 K has been measured by detecting fluorescence pulses from deliberately added anthracene. Herzberg—Teller activity was detected for Some A 1 vibrations. The two-photon operators contribute to the two-photon cross section in the order yy ≈ zz ⪢ xx.
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