Na ns and np states

The Na ns and np states, having quantum defects of 1.35 and 0.85 respectively, are well removed from the hydrogenic 2 states, and as a result the cross sections 

One of the most interesting aspects of the study of the Na ns and np states is the distribution of final states. In Fig. 13.5 we show the field ionization signals obtained when the 39p, 40s, 39d, and 40p states are exposed to 43 eV Na+ ions.10 There is an initial adiabatic peak and a later broader diabatic feature. The Na+ current is more than adequate to depopulate the 39d state, and the 39d signal presumably reflects substantial population of the higher , m states of n = 39, due to both non-dipole low velocity collisions and multiple collisions. As shown by 

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