Vibronic features of 2,6-dimethylaniline, 2,6-dimethylaniline–NHD, and 2,6-dimethylaniline–ND2 by resonant two-photon ionization mass spectrometry

Abstract

The vibronic spectra of jet-cooled 2,6-dimethylaniline, 2,6-dimethylaniline–NHD, and 2,6-dimethylaniline–ND₂ resulting from the S₁←S₀ electronic transition have been simultaneously recorded using resonant two-photon ionization mass spectrometry. The newly observed spectral features show that the active vibronic transitions are related to the aromatic ring vibrations, the NH₂ inversion, and the CH₃ rotational motions. These spectroscopic data are found to be consistent with the structural change upon electronic excitation, as predicted by abinitio calculations.