Quadrupole splitting of the weakly bound system [(dtmy)11dee]

The energy lovels of the molecular complex [(dtmy)11dee] are close to the sum of the energies of the (dtmy)11 and D2 molecules; the small difference of a few meV, referred to as 'finite size correction', is an effect of the Coulomb interaction with the spatially distributed electrical charge in the compound nucleus of the complex. The quadrupole terms in the multipole expansion of the latter are shown to interfere with the spin interactions and to modify the hyperfine structure of the levels of the complex in a way that may affect the resonal formation rate of (dtmy)11.