Excited state, charge transfer absorption spectrum of HgBr in the blue (λ∼447 nm)

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Abstract
Absorption from the lowest-lying ion pair state of HgBr (i.e., Hg+–Br−: B 2∑+1/2 ) has been observed by transient absorption spectroscopy in a pulsed, transverse discharge containing a mixture of Ne, N2, and HgBr2 vapor. A highly structured band peaking at ∼447 nm is shown to be associated with charge–transfer transitions from the B 2∑+1/2 state to a higher-lying, covalently bonded (Hg*–Br) state. By pumping the 447 nm transition with a pulsed dye laser while simultaneously monitoring gain on the HgBr (B 2∑+1/2 →X 2∑+1/2 ) band at 502 nm, the absorption cross section for the blue band was measured to be (3.0±1.5)×10−17 cm2 and the saturation intensity for the transition at 447 nm was determined to be 710±50 kW cm−2.