Abstract
A new ion-pair state of Br2 has been identified by a sequential two-photon excitation technique through the B 3Π0u+ state. The associated UV emission spectra are analyzed as a function of excitation frequency and the new state can be assigned to f(0+g) which correlates with Br−(1S)+Br+(3P0). The spectroscopic constants for 79Br2 are Te=53 101.7 cm−1, ωe=152.8 cm−1, ωexe=0.42 cm−1, Be=0.042 60 cm−1, and re=3.167 Å.
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