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 (4S) nitrogen atoms interact, they can follow any of four potential energy curves corresponding to the N2 molecule; the X 1Σ+g, A 3Σ+u, 5Σ+g, and 7Σ+u curves. Transport collision integrals for the 1Σ+g and 3Σ+u states have been calculated by representing the potentials for these states with the Hulburt–Hirschfelder potential. The 5Σ+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 7Σ+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.