15min:

SERGEY I. PANOV, DAVID E. POWERS, TIMOTHY A. BARCKHOLTZ AND TERRY A. MILLER, Laser Spectroscopy Facility, Department of Chemistry, The Ohio State University, Columbus, Ohio 43210.

The two-color \left( 1+1'\right) REMPI and ZEKE spectra of the CdCH₃ and ZnCH₃ radicals are reported for the first time. Based upon the observed intensities in the ZEKE spectrum for CdCH₃, via transitions to different vibrational levels of the \widetildeA\,²E intermediate state, the band previously assigned as the upper spin-orbit component of the vibrationless level of the \widetildeA\,²E<- \widetildeX\,²A₁ transition in neutral CdCH₃ is reassigned. This band which has now been observed in both LIF and REMPI experiments, is reassigned as the 6₀¹ band of the lower spin-orbit component, ²E_1/2. The ZEKE spectra, taken via various intermediate rovibronic levels, are used to reveal rovibrational structure of the CdCH₃ and ZnCH₃ cations and to measure the adiabatic ionization energies for both radicals. These radicals belong to the C_3v point group and are therefore subject to a Jahn-Teller interaction in the \widetildeA state, which allows a broader range of K' states to be accessible in the LIF and REMPI experiments thereby enabling access to a broader range of K states for the ions in the ZEKE experiment. The resolved K structure in the level with one quanta of ₆ excitation in the ion enables estimates of both the rotational constant A and the coriolis coupling constant a\zeta _t to be made. Vibrational frequencies and assignments for the ions will be reported.