Knowledge Bank

Laser-induced fluorescence spectra of selected features of the band $A~2\Sigma +-X~2\Pi i$ systems of the SiCH and GeCH radicals have been recorded at sub-Doppler resolution. As in previous $studies,ab$ the radicals were produced in a pulsed discharge jet source using methyltrichlorosilane and methyltrichlorogermane as precursors. With linewidths of 35 MHz, the proton magnetic hyperfine splittings have been resolved and the upper state Fermi contact parameter determined. In addition, optical Stark experiments were performed to measure the ground and excited state permanent electric dipole moments. The analysis of the Stark and hyperfine data will be presented and the derived parameters will be discussed.