The vibrational distribution of HgBr (X²∑) molecules formed by photodissociation of HgBr₂ at 193 nm

Laser-induced fluorescence excited from the HgBr (B²∑-X ²∑) bands has been used to determine the vibrational distribution of HgBr (X²∑) photofragments of the photodissociation of HgBr₂ at 193 nm. The fraction of HgBr molecules initially formed in the B²∑ state was determined to be 60_-10 ⁺¹⁵%. The remaining 40_-15⁺¹⁰% of molecules directly formed in the HgBr (X²∑) ground electronic state constitutes an important channel for photodissociation at 193 nm.