Mass-analyzed threshold ionization spectroscopy of trans-o-methylanisole

Add time:08/30/2019    Source:sciencedirect.com

In this study, we recorded the vibronic and cation spectra of trans-o-methylanisole by using resonant two-photon ionization and mass-analyzed threshold ionization techniques. The excitation energy of the S1 ← S0 transition and the adiabatic ionization energy were measured as 36,364 ± 2 cm−1 and 64,755 ± 5 cm−1, respectively. The red shifts of these values with respect to those of anisole and toluene indicated that the interactions of CH3 and OCH3 substituents with the ring are stronger in the electronically excited S1 and cationic ground D0 states than that in the electronically ground S0 state. Most of the observed bands in the S1 and D0 states involve in-plane ring deformation and methyl internal rotation. The vibrational frequencies of modes 6b1, 6a1, and 11 were lower in the S1 state than in the D0 state. This suggested that trans-o-methylanisole is more rigid in the D0 state than in the S1 state.

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