Abstract
The collisional de-excitation cross sections of the 62 P3/2 metastable state of thallium have been measured for the following atoms and molecules: He, Ne, Ar, TlI, TlBr, TlCl, O2, NO, H2, CO, CH4, C2H4, C2H6, C3H6, C3H8, CO2, and N2. Metastable thallium was produced in a quartz cell by photodissociating thallium halide vapor with a pulse of ultraviolet radiation. The density of the metastable thallium decays due to collisions with the gas added to the cell. The decay is exponential with a time constant governed by the density of the added gas. The lifetime of the metastable state was measured by monitoring the absorption of the thallium 5350 Å line from a beam of resonance radiation passing through the cell. Since the density of the added gas is known, the cross section can be computed from the measured lifetime. Our results are accurate to about 15%.
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