Tunable laser photodissociation of HgI2: Quantum yield for formation of excited I(5 2P1/2) atoms

Publisher Website
Google Scholar
Abstract
Tunable laser, infrared fluorescence techniques are used to study the detailed photodissociation dynamics of the linear triatomic molecule HgI2. The quantum yield of excited I(5 2P1/2) atoms has been measured in the first long wavelength absorption band of HgI2 from 265 to 320 nm. From quantitative measurements of the yield of excited I atoms, it is shown that the total absorption cross section in this region is actually composed of two distinct components. These components correspond to states leading to both excited and ground state I atoms according to the processes HgI2→HgI+I or I*. From the time decay of the excited I* atoms as a function of HgI2 pressure, the collisional deactivation rate of I* by the parent HgI2 molecule has been obtained. This quenching rate constant is 4.5±0.2×10−10 cm3 molecule−1 s−1 at T=453 K, which is essentially a gas kinetic rate.

This publication has 17 references indexed in Scilit: