Together with other evidence discussed below, this leads to considering it as a transient species that can rapidly dissociate and possibly reassociate, reaching a more favorable excimer arrangement. This assumption is further corroborated by the observation that an accurate computational estimate should also consider the poor reproduction of the correct La -Lb ordering and energy gap (-57 meV vs 370 meV). If the values in Table are corrected with a rigid shift accounting for this difference, it becomes immediately apparent that cluster 9 does not survive as a stable structure.