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We describe a series of measurements of pressure-broadening coefficients for the F′ ) 3 r F′′ ) 4 line of the 2 P 1/2 r 2 P 3/2 transition in atomic iodine. This is the optical transition of the chemically pumped atomic iodine laser (COIL), and our results are relevant to a more complete understanding of this important class of high-power lasers. The measurements were made in sealed cells using an argon ion laser to photodissociate molecular iodine and a tunable diode laser to probe directly the atomic transition. We measured broadening coefficients for three bath gases: He, N 2 , and O 2 . Full absorption line shapes were recorded as a function of the added bath gas pressure and the following values were obtained at room temperature: (∆ν/∆P He ) T)296K ) 3.2 ( 0.3 MHz/Torr, (∆ν/∆P N2 ) T)296K ) 5.5 ( 0.6 MHz/Torr, and (∆ν/∆P O2 ) T)296K ) 5.0 ( 0.5 MHz/ Torr; where ∆ν is the full width at half-maximum. We also measured the temperature dependencies of the He and O 2 broadening coefficients over the range 296 K < T < 775 K. We quote the temperature-dependent values as (∆ν/∆P He ) T ) (3.2 ( 0.3) × (296/T) 0.36 and (∆ν/∆P O2 ) T ) (5.5 ( 0.6) × (296/T) 0.70 . Comparisons to previous measurements are also discussed. † Part of the special issue "Donald Setser Festschrift".

a fo(pro, . r) dr 0 =i exp(-2iKoa)-2rxo s fo and this in conjunction with Eq. (7) establishes the original perturbation formula (1).We see that the heuristic calculation of the text, based upon the 5-function potential (4), has correctly obtained the form of the general result. The derivation given in this appendix only assumes that v(r)+Au(r) obey the usual analytic conditions required for Poincare's theorem.The five hyperfine transition frequencies of the $5~2 ground state of Mn have been measured 55 in a spin-exchange optical pumping experiment. The optical pumping flasks contained a neon buffer gas, and the measurements were made as a function of buffer-gas pressure. The measurements were carried out at a temperature of 700 'C. The linewidth of the Mn signal was typically 300 Hz. The hyperfine interaction constants were found to be A= -72420 836 (15) Hz, B= -19031(17)Hz, C= -0.7+1.1 Hz, ) D) &0.25 Hz, and ) E) &0.02 Hz. The fractional pressure shift in A was found to be (1/A) (SA/BP) = {2.6 + 0.2) x10-Torr . No pressure dependence of the other interaction constants was observed.

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