Study of the OD EPR phenomena in (COF)2 excited to single rotational levels of the 801,501,711801and501711 vibronic states: cluster formation investigated by the OD EPR

OD EPR spectra were recorded for a˜3Au triplet levels of (COF)2, coupled by intramolecular interactions to levels of an adjacent A˜1Au singlet state, by exciting the molecule into individual rovibronic levels of this singlet state. The spectra were recorded for J′ = 0−5; Ka′=0 and J′ = 1−5; Ka′=1. Spectroscopic parameters of the a˜3Au state were estimated by fitting a theoretical model to the experimental spectra. The VdW complex and cluster formation effects were observed in the OD EPR spectra and in the time-resolved molecular beam experiments for the Ar + (COF)2 + NO mixtures. OD EPR line broadening and fluorescence lifetime reduction in presence of NO were interpreted as resulting from cluster formation.