Simple method for determination of stimulated emission cross section of 2P1/2(F=3)→2P3/2(F'=4) transition in atomic iodine

It is shown that the stimulated emission cross section σ_3—4 of the ²P_1/2(F=3)→²P_3/2(F'=4) transition in iodine can be determined without allowance of the influence of chemical reactions on the population inversion and mixing of sublevels with the ground ²P_3/2 and excited ²P_1/2 states of iodine. A report is given of measurements of the σ_3–4 cross section as a function of the pressure of CF₃I, n-C₃F₇I, and i-C₃F₇I vapors and of He, Ne, Ar, and Xe inert gases. The collisional (impact) widths of the transition profile and of the coefficients of collisional broadening by these gases are obtained. A comparison is made with the theory and with the results of published investigations.