VIBRONIC FEATURES OF 2,6-DIMETHYLANILINE, 2,6-DIMETHYLANILINE-NHD, AND 2,6-DIMETHYLANILIN-ND2 BY RESONANT 2-PHOTON IONIZATION MASS-SPECTROMETRY

The vibronic spectra of jet-cooled 2,6-dimethylaniline, 2,6-dimethylan iline-NHD, and 2,6-dimethylaniline-ND2 resulting from the S-1 <-- S-0 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 NH, inversion, and the CH, rotational mo tions. These spectroscopic data are found to be consistent with the st ructural change upon electronic excitation, as predicted by ab initio calculations.