VIBRATIONAL DYNAMICS AROUND THE CONICAL INTERSECTION RESULTING FROM THE $\tilde{A} \rightarrow \tilde{X}$ LASER INDUCED FLUORESCENCE OF THE METHOXY (CH$_3$O) RADICAL

Abstract

The results of a theoretical calculation of the spectra associated with the laser induced fluorescence $\tilde{A}^2A_1\rightarrow \tilde{X}^2E$ of both the methoxy molecule and CH$_2$DO are presented and discussed. The form of the vibronic dipole moment is determined by symmetry and the corresponding dipole expansion coefficients are calculated using {\it ab initio} methods. The calculated spectra include states up to 3000 cm$^{-1}$ above the zero point energy. We describe how the various features of the spectrum are related to coordinate dependent terms in the dipole expansion as well as the spin-orbit couplings, Jahn-Teller couplings, and vibrational anharmonicities.