Kinetics of Iodine Monofluoride Excitation by Energetic Nitrogen.
Final rept. 16 Jun 83-16 Aug 84,
PHYSICAL SCIENCES INC ANDOVER MA
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We studied the production and loss of IF Iodine MonoFluoride in our flow system using a laser-induced fluorescence diagnostic for measuring IF number densities. We related the production of F-atoms to the residence time of CF4 in the microwave discharge and found a yield of about 0.3 F-atoms per CF4 molecule under typical operating conditions. We identified flow conditions that produce complete reaction of CF3I in the injector and showed that a negligible amount of IF is destroyed in the injector under these conditions. Some loss of IF in the main flow tube was found at low flow velocities however, this loss appeared to be negligible at higher velocities and permitted us to operate in a regime where IF number densities were directly related to the amount of CF3I flowing into the injector. We also found that operation of the injector using excess CF3I resulted in the deposition of an optically opaque thin film on the reactor walls. This required us to operate in excess F-atoms and eliminated the need to measure absolute F-atom number densities. Keywords Iodine monofluoride Electronic quenching Electronic excitation Energy transfer Photon yields R-centroid Excited nitrogen Vibrational relaxation Transition probabilities and Flow reactor.
- Radiation and Nuclear Chemistry
- Atomic and Molecular Physics and Spectroscopy