Transport Properties of Ground State Nitrogen Atoms

Transport properties of dilute monatomic gases depend on the two body atom-atom interaction potential. When two ground state ( ⁴ S) nitrogen atoms interact, they can follow any of four potential energy curves corresponding to the N ₂ molecule; the X ¹ Σ ⁺ _g , A ³ Σ ⁺ _u , ⁵ Σ ⁺ _g , and ⁷ Σ ⁺ _u curves. Transport collision integrals for the ¹ Σ ⁺ _g and ³ Σ ⁺ _u states have been calculated by representing the potentials for these states with the Hulburt-Hirschfelder potential. The ⁵ Σ ⁺ _g state has a large local maximum which requires changes in the computational procedure used previously; a modified Hulburt-Hirschfelder potential has been used to represent the potential for this state. Collision integrals for the ⁷ Σ ⁺ _u state have been obtained by direct use of a recent theoretical potential for this state. The collision integrals are compared with results obtained in previous studies.