Absorption from the lowest-lying ion pair state of HgBr (i.e., Hg +-Br-:B 2Σ1/2+) 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 2Σ1/2 + 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 2Σ1/2 +→X 2Σ1/2+) 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.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry