Laser determinations of ‘‘hot band’’ quantum yields: Br*(2 P 1/2) formation in the continuum absorption of Br2 at 510–550 nm

Absolute quantum yields of Br* in the photodissociation of thermally excited vibrational levels of Br2 are measured by transient gain vs absorption probing of the Br*(2P1/2)–Br(2P3/2) transition at 2.7μm with an F-center laser. An etalon-narrowed pulsed dye laser with a linewidth of 0.04 cm−1 is used to excite continuum regions between the bound Br2(B–X) transitions of isotopic Br2(∼81% 81Br2) at selected wavelengths between 510 and 550 nm. The …