Crossed-beam studies of some chemiluminescent reactions producing IF
Abstract
This paper describes the study of the chemiluminescent branch of the reactive collisions of molecular fluorine F2 with a series of iodides, HI, CF3I, CH3I, CH2I2 and CHI3. All these reactions can produce IF in its A and B excited states, but in crossed molecular beam conditions, only the B state can contribute to the observed chemiluminescence signals. These signals have been studied as a function of the reactant densities and of the collision kinetic energy, providing in particular estimates of the reaction thresholds. The spectrum of the F2+HI chemiluminescence has been recorded and analyzed in terms of the IF B state rovibrational distribution. To explain our observations, we have extended a model, previously developed by C. C. Kahler and Y. T. Lee for the I2+F2 chemiluminescent reaction, by introducing a migratory step.