ZERO PRESSURE LIFETIMES AND FLUORESCENCE QUENCHING OF ICI (A3PI1)

Lifetimes of ICl(A 3Π1) are measured by laser-induced fluorescence. Zero pressure lifetimes for excitation between 589 and 669 nm range from 405±40 to 460±40 μsec. Quenching cross sections measured at 293°K near 603 nm vary between 110 Å2 for ICl itself and 0.7 Å2 for Ne. A radiative lifetime of about 650 μsec was estimated from the integrated absorption spectrum. © 1979 American Institute of Physics.