The adiabatic ionization energy of p-methylanisole is measured to be 63 972 +/- cm(-1), which is red-shifted with respect to those of anisole and toluene. This indicates that the interaction of either CH3 or OCH3 group with the ring is stronger in the cationic D-0 state than that in the neutral S-0 state. Most of the observed MATI bands result from in-plane ring vibrations. The frequencies of vibrations 9b, 6a, and 1 of the p-methylanisole cation are found to be 407, 515, and 811 cm(-1), respectively. (c) 2005 Elsevier B.V. All rights reserved.