Abstract
An improved theory within the frame work of Fermi's Free-Electron model has been proposed to evaluate the Hornbeck Molnar Ionization (HMI) cross sections, and has been applied to investigate the formation of homonuclear alkali diamers at thermal energies. The calculated cross sections for all homonuclear pairs involving Rydberg alkali atoms and the ground state alkali atoms are compared with the available experimental results. In the limit of large n (the principal quantum number of the parent Rydberg atom) present results predict the correct asymptotic behavior but disagree considerably with the earlier findings of Kumar and Gounand [J. Phys. B 20 (1987) 2773].
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