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We report the investigation of the 3s <- 2p transition in the BAr2 cluster.In a supersonic expansion of B atoms entrained in Ar, at high beam sourcebacking pressures we observe several features in the fluorescence excitationspectrum which cannot be assigned to the BAr diatom. Using BAr(X, B) potentialenergy curves which reproduce our experimental observations on this moleculeand an Ar-Ar interaction potential, we employ a pairwise additive model, alongwith variational and diffusion Monte-Carlo treatments of the nuclear motion, todetermine the lowest vibrational state of the BAr2 cluster. A subsequentsimulation of the fluorescence excitation spectrum reproduces nearlyquantitatively the strongest feature in our experimental spectrum notassignable to BAr. Because of the barrier in the BAr(B 2Sigma+) potentialenergy curve, the 3s <- 2p transition in the BAr2 cluster is predicted to havean asymmetric profile, as is found experimentally.Comment: a pdf file (5 kB) containing the abstract can be retrieved as  ftp://mha-ibm2.umd.edu/pub/publications/BAr2.abs.pdf a pdf file (325 kB)  containing the entire manuscript can be retrieved as  ftp://mha-ibm2.umd.edu/pub/publications/BAr2.ms.pdf To appear in J. Chem.  Phys. 106 (1997) 8 April issue

A collaborative theoretical and experimental study of the structure and electronic excitation spectrum of the Bar and Bar2 complexes