Crossed-beam studies of some chemiluminescent reactions producing IF

This paper describes the study of the chemiluminescent branch of the reacti ve collisions of molecular fluorine F-2 with a series of iodides, HI, CF3I, CH3I, CH2I2 and CHI3. All these reactions can produce IF in its A and B ex cited states, but in crossed molecular beam conditions, only the B state ca n contribute to the observed chemiluminescence signals. These signals have been studied as a function of the reactant densities and of the collision k inetic energy, providing in particular estimates of the reaction thresholds . The spectrum of the F-2 + HI chemiluminescence has been recorded and anal yzed in terms of the IF B state rovibrational distribution. To explain our observations, we have extended a model, previously developed by C. C. Kahle r and Y. T. Lee for the I-2 + F-2 chemiluminescent reaction, by introducing a migratory step.