The jet-cooled 2,6-difluorobenzyl radical was generated and vibronically excited in a corona excited supersonic expansion from the gas mixture of 2,6-difluorotoluene and a buffer gas He. The vibronically resolved emission spectra of the jet-cooled 2,6-difluorobenzyl radical have been recorded with a long path monochromator in the visible region and analyzed to give accurate electronic transition and vibrational mode frequencies in the ground electronic state by comparing with those of 2,6-difluorotoluene as well as those from an ab initio calculation.

The jet-cooled m-chlorobenzyl radical has been generated for the first time from m-chlorotoluene with a large amount of carrier gas He in a corona excited supersonic expansion using a pinhole-type glass nozzle. The visible vibronic emission spectrum of the m-chlorobenzyl radical in the transition of D 1 f D 0 has been recorded with a long path monochromator. The spectrum has been analyzed to obtain the accurate electronic transition and vibrational mode frequencies in the ground electronic state by comparing with those of an ab initio calculation and of m-chlorotoluene.

The jet-cooled o-chlorobenzyl radical has been generated for the first time from o-chlorotoluene seeded in a large amount of inert carrier gas He and vibronically excited using a pinhole-type glass nozzle in a corona excited supersonic expansion. The vibronic emission spectrum of the o-chlorobenzyl radical in the D 1 f D 0 transition has been recorded with a long path monochromator in the visible region. The spectrum has been analyzed to determine accurate electronic transition and vibrational mode frequencies in the ground electronic state by comparison with those from an ab initio calculation as well as those of o-chlorotoluene.

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