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

• Published in: The Journal of chemical physics 1986-09, Vol.85 (6), p.3188-3193
• Main Authors: GREENE, D. P, KILLEEN, K. P, EDEN, J. G
• Format: Article
• Language: English
• Subjects: Atomic and molecular physics; Exact sciences and technology; Molecular properties and interactions with photons; Molecular spectra; Physics; Visible spectra
• ISSN: 0021-9606; 1089-7690
• DOI: 10.1063/1.450985

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.