Chain Reaction Mechanism for I2 Dissociation in the O2 (1 delta)-I Atom Laser.
AEROSPACE CORP EL SEGUNDO CA AEROPHYSICS LAB
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A chain reaction model for I2 dissociation in O2 is proposed. Experiments in a computer-controlled flow tube apparatus indicate that I2 X dissociation is initiated by collisions with O21 sigma subsequently, the I atoms formed are pumped to I by O21delta. Other initiation mechanisms are also discussed. Chain branching occurs when I transfer energy to I2X to form I2 and I2 is dissociated into I atoms by collisions with O21 delta. Chain termination in these experiments is caused by I-atom wall recombination. An analytic model is presented that favors the above explanation over several others that are kinetically similar. Numerical modeling calculations are included to verify this simplified model. Scaling relationships are developed for I2X dissociation as a function of O21 delta, O23 sigma, I2O, H2O, and Ar. The I2 intermediate I2 is not directly observed however, indirect evidence indicates that it is vibrationally excited I2X.
- Atomic and Molecular Physics and Spectroscopy