Radiative and non-radiative decay of selected vibronic levels of the B state of alkoxy radicals

We have measured the lifetimes of some of the prominent bands observed in the moderate-resolution, jet-cooled laser induced fluorescence excitation spectra of the B←X transition of ethoxy, all the structural isomers of propoxy and butoxy, and 1-pentoxy. Recent high-resolution, rotationally resolved studies on primary alkoxy radicals have given conformer specific assignments for the bands for which lifetimes have been measured. We report observed lifetime trends as a function of vibrational excitation for specific isomers and conformers. The implications of these observations for the dynamics of the B state will be discussed.