The transport properties of dissociating hydrogen gas have been calculated from 1000°K to 15 000°K with the assumption of no ionization or electronic excitation. The rigorous kinetic-theory formulas, which have recently been modified to take into consideration the multiplicity of interaction curves, were used in the calculations. The transport coefficients at each temperature are tabulated as a function of composition rather than pressure for reasons of compactness and ease of interpolation. The fact that the collision integrals for the H-H interactions are abnormally large compared to those for the H-H2 and H2-H2 interactions causes the transport properties of the mixtures to exhibit somewhat unusual behavior as a function of composition at constant temperature and pressure. Various approximate formulas for the calculation of transport properties of mixtures have been checked against the results of the rigorous calculations. The errors in the viscosity and thermal conductivity are about 10%. For the Prandtl number, however, which involves the ratio of these coefficients, the error is only about 1%.

Potential-energy curves for the X 1Σ+, A 1Π, I 1Σ−, a 3Π, a′ 3Σ+, d 3Δi, and e 3Σ− electronic states of CO and the X 2Σ+, A 2Πi, and B 2Σ+ electronic states of CO+ have been calculated using a modification of the Rydberg—Klein—Rees method. The curves for the a 3Π, d 3Δi, and A 2Πi states, which are intermediate between Hund's Cases (a) and (b), represent fictitious rotationless states calculated using the true Bv. Benesch and co-workers have shown theoretically that this representation is correct for such intermediate cases. The numerical results for the A 2Πi state presented here confirm their conclusions.

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A brief discussion of a program for evaluating the integrals which appear in the Rydberg—Klein—Rees (RKR) method of determining potential curves from spectroscopic data is given. Application is made to the ground states of H2 and I2 and the results compared to earlier calculations.

Transport properties of dissociating nitrogen and dissociating oxygen have been calculated from 1000° to 10 000°K with the assumption of no ionization or electronic excitation, using rigorous kinetic-theory formulas. The transport coefficients at each temperature are tabulated as a function of composition. The transport properties of the mixtures exhibit no special unusual features (unlike hydrogen). Various approximate formulas for the calculation of transport properties of mixtures have been checked against the results of the rigorous calculations, and give agreement to about 5%. A few checks of the calculations against experimental diffusion coefficients, viscosities, and thermal conductivities are possible, and the agreement seems reasonable.