DE-EXCITATION OF ELECTRONICALLY EXCITED SODIUM BY NITROGEN AND SOME OTHER DIATOMIC MOLECULES.
INSTITUTE FOR DEFENSE ANALYSES ARLINGTON VA SCIENCE AND TECHNOLOGY DIV
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A semiquantitative calculation was made of the cross sections for the de-excitation of sodium by nitrogen as a function of initial kinetic energy and final vibrational quantum number vf. The large observed total cross section, which is of gas kinetic order, can be explained by an intermediate ionic state, involving Na and N2-v v-. This state is unstable at infinite separation of the atom and molecule but, because of the Coulomb attraction, it becomes stable at distances below approximately 3A. As a result of the vibrational structure of N2-v- and of the final state, N2vf, a classical diffusion is considered of the probability amplitudes through a two-dimensional network of potential-energy curves which have the vibrational structure, v- and vf, and the electronic state as parameters. The calculations were made for a variety of incident energies and impact parameters and assumed values of the polarizability of the Na N2- complex. Results are also presented regarding cross sections for the quenching of Na3 doublet P by CO and O2 and of Na4 doublet P by N2. All the results have the same general character The total cross sections are of gas kinetic order, and depend only weakly on kinetic energy. Author
- Atomic and Molecular Physics and Spectroscopy