Characteristics of the Low Frequency Sequence Bands Observed in the Vibronic Emission Spectra of the Jet Cooled p-Fluorobenzyl Radical in the <TEX>$D-1 ightarrow D_0$</TEX> Transition

The p-fluorobenzyl radical was generated from the p-fluorotoluene and vibronically excited in a corona excited supersonic expansion with inert buffer gases. The vibronic emission spectra of the jet cooled p-fluorobenzyl radical in the D1 → D0 transition have been observed in the visible region. The spectra exhibit several low frequency sequence bands in the vicinity of the every strong vibronic band. The characteristics of the sequence bands have been examined by varying the experimental conditions such as carrier gas and nozzle size to identify the origin of the transition in the spectra.