α${\mathrm{-}}^{18}$O and α-Ca cluster configurations of ${}_{}{}^{22}{}_{}{}^{}\mathrm{Ne}$ and the ${}_{}{}^{46}{}_{}{}^{}$,48,52Ti isotopes, respectively, have been studied in a microscopically founded model, treating antisymmetrization between the clusters correctly. Depending on the respective ground state structure, these systems show rotational bands with weak (Ti isotopes) and strong ${(}^{22}$Ne) parity splitting. Irrespective of the degree of parity splitting, both cases exhibit E1 transitions between these cluster states, which are strong on the appropriate molecular scale. Though the influence of inelastic channels is discussed in qualitative terms only, both ${}_{}{}^{22}{}_{}{}^{}\mathrm{Ne}$ and the Ti isotopes appear to be promising candidates for the molecular-dipole degree of freedom to be seen in light nuclei.

• Received 14 April 1986

DOI:https://doi.org/10.1103/PhysRevC.35.755