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9 pages, 6 figures, 4 tables.-- PACS: 31.50.-xAn empirical intermolecular potential surface is proposed for the He–I2(B3IIu) complex, modeled as a sum of pairwise He–I Morse interactions plus a three-body interaction term. The potential reproduces with very good agreement the spectral blueshifts and vibrational predissociation lifetimes measured for He–I2(B,v') in the range v'=10–67 of I2 vibrational excitations. In particular, the accuracy achieved in the description of the experimental data for high   \udv' levels is attributed to the three-body interaction term included in the potential. The behavior of the potential surface with the I–I separation is analyzed and correlated with the experimental findings.This work was supported by C.I.C.Y.T. (Ministerio de\udEducación y Ciencia ), Spain, Grant No. FIS-2004-02461.Peer reviewe

An empirical potential-energy surface for the He–I2(BΠu3) van der Waals complex including three-body effects