Abstract
An atomic fluorescence method has been used to detect iodine atoms in concentrations lower than 1010/cm3. The heart of the apparatus is a “solar-blind” photomultiplier having practically no sensitivity to radiation of wavelengths longer than 2500 Å, but with good response in the region of the two strong iodine atomic resonance lines near 1800 Å. In combination with a small photolysis flashlamp, the system is used to study recombination of ground-state (2P3/2) iodine atoms in pure I2 vapor. At pressures below 0.2 torr the removal of atoms is seen to be predominantly a first-order diffusion-controlled process, characterized by a wall sticking probability of 0.040–0.065 and a binary diffusion cross section of 100 Å2. The reaction I+I2→I3 is found to be of minor significance in this study; a rough estimate indicates that fewer than one in 104 I–I2 collisions lead to the formation of I3.
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