FINE STRUCTURE FORMATION IN ELECTRONIC SPECTRA OF LARGER MOLECULES

Approximate formulas, derived by use of Gora's asymptotic method, are given for rigid asymmetric rotor eigenvalues in the regions where they are degenerate in either Ka or Kc. The formulas are used to describe the various ways in which a resolved (or resolvable) rotational fine structure in the electronic spectra of larger molecules can arise. The formation of fine structures in the spectra of planar or near-planar molecules (such that the inertial defect, Δ, is much less than IC) is examined in detail. © 1969.