Heterogeneous perturbations 2 E + ~ 2 Π of largely different magnitudes are observed with high resolution in the vacuum-ultraviolet absorption and in the infrared emission spectrum of the NO molecule. The rotational interactions between 2 Σ + Rydberg states and levels of the B 2 Π non-Rydberg state are shown to be "configurationally forbidden", but produced by the configuration interaction between the non-Rydberg levels and 2 Π Rydberg states. The latter together with the 2 Σ + Rydberg states form p complexes. In this way the interactions display the l uncoupling in the complexes; they can be evaluated theoretically and can be analyzed fully. The cases of the strong interactions D 2 Σ + (v = 3) ~ B 2 Π(v = 16)and D 2 Σ + (v = 5) ~ B 2 Π(v = 21) and of the weaker D 2 Σ + (v = 1) ~ B 2 Π(v = 11), all three observed as perturbations in ε bands crossing 3 bands, are discussed in detail. It is further shown that perturbations between γ bands and β bands as well as perturbations between analogous bands of higher principal quantum number are absent, and thus the assignment of the A 2 Σ + and E 2 Σ + states to the s Rydberg series is confirmed.
No takes yet. Share an insight, caveat, or question.
Jungen et al. (1968) studied this question.