We investigate the electronic background as well as the 02-03 mode at 330 cm−1of highly doped YbBa2Cu3O7−δin B1gsymmetry. Above the critical temperature T.cthe spectra consist of an almost constant electronic background and superimposed phononic excitations. Below Tcthe superconducting gap opens and the electronic background redistributes exhibiting a 2Δ peak at 320 cm−1. We use a model that allows us to separate the background from the phonon. In this model the phonon intensity is assigned to the coupling of the phonon to inter- and intraband electronic excitations. For excitation energies between 1.96 eV and 2.71 eV the electronic background exhibits hardly any resonance. Accordingly, the intraband contribution to the phonon intensity is not affected. In contrast, the interband contribution vanishes below Tcat 1.96 eV while it remains almost unaffected at 2.71 eV.