Halo molecular systems: description of dipolar anions in the continuum
By K. Fossez (GANIL)
Dipolar anions, like LiI-, LiCl-, LiF- or LiH- are arguably one of the most spectacular examples of weakly bound mesoscopic open quantum systems. The theoretical description of their halo radii and excitation spectra is a major challenge to molecular physics community. We apply the complex-energy continuum shell model based on the Berggren ensemble, the so-called Gamow Shell Model (GSM), to evaluate the structure of polar anions. GSM results are then compared with the Coupled-Channel (CC) results associated with the pseudo-potential method. It is shown that the GSM provides a precise description of the most weakly bound excited states of dipolar anions and can applied successfully to study dipolar anion resonances where the direct integration method of the CC approach fails.