The dissociation of 0-, m-, and p-chlorofluorobenzene (CFB) and their Yan der Waals clusters in supersonic jets were studied by resonance-enhanced multiphoton ionization (REMPI) combined with time of flight (TOF) mass spectrometry. The elimination of the C1 atom to produce C6HdF+ was,found to occur in the dissociative u,?r excited state of the parent molecular ion reached by three-photon absorption via the SI state of the neutral molecule. The dimers and higher clusters are easily formed for 0-and m-CFB but not for p-CFB. The C1 elimination reaction was found to be greatly enhanced by formation of the clusters for 0-and m-CFB. The enhancement and mechanism of the elimination reaction are discussed.

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