Two-photon Excitation Spectra of 1-Azabicyclo[2.2.2]octane and Trimethylamine

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Abstract
The two-photon fluorescence excitation spectra of 1-azabicyclo[2.2.2]octane (ABCO) and trimethylamine were measured in the excitation wavelength range of 410–520 nm. The effect of the polarization (linear or circular) indicates that the symmetries of the upper states are \ ildeA1A1, \ ildeB1A1, and \ ildeC1E for ABCO while \ ildeA1A1 and \ ildeB1E for trimethylamine in C3v point group approximation. Rotational envelopes for the sequence structures are calculated forcircularly and linearly polarized light excitation and are in good agreement with experiment.