The technique for measuring the diffusion coefficients of reactive atomic species through their radiative recombination reactions is applied to multicomponent mediums. A series of diffusion coefficients of chlorine atoms in chlorine molecules mixed with rare gases M(He, Ne, Ar, Kr, and Xe) were measured for various Cl2 and M mole fractions. By extrapolating to zero molecular chlorine pressure, the diffusion coefficients of chlorine atoms in rare gases were obtained. The measured values of the diffusion constant are DCl–He =0.75±0.12, DCl–Ne =0.32±0.05, DCl–Ar =0.19±0.03, DCl–Kr =0.14±0.02, and DCl–Xe =0.12±0.02 cm2/s, respectively, at 296 K and 1 atm rare gas pressure. The corresponding hard sphere collision diameter of chlorine atoms in rare gases was calculated and a comparison was made between the diffusion coefficients of Cl–rare gas and Ar–rare gas systems at 296 K.

The time-decay chemiluminescence of reactive atomic species through their recombination reactions was employed to measure the diffusion coefficients of chlorine atoms in inert molecules: nitrogen, carbon dioxide, carbon tetrafluoride, and sulfur hexafluoride. The values of the diffusion constants were measured to be Z>C1_N2 = 0.230 ± 0.035, Z)C1_C02 = 0.190 ± 0.029, Dq_cf4= 0.132 ± 0.020, and Z)Ci-sf6 = 0.098 ±0.015 cm2 345/s, respectively, at 1 atm and 296 K. The hard-sphere collision diameter of the chlorine atom was calculated. A comparison was made between the diffusion constants of chlorine atoms and argon atoms in these media.

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