Abstract
The frequency of oscillation of an iodine photodissociation laser has been measured for argon buffer gas pressures up to 7 atmospheres. The variation in frequency of the 1.315 μm transition can be explained solely by the overlapping of the hyperfine split transitions at high pressures, and no evidence is obtained for a collisional frequency shift. A pressure broadening parameter of 4.5 MHz/torr for argon-iodine collisions is deduced from the observed frequency shifts.
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