Energy dependence of excitations near the Fermi surface in Bi(Pb)-2212 and Bi(Pb)-2201

In Bi derived HTc-cuprates the question of how many excitations occur near the Fermi surface is not yet completely answered. There are hints that more than the two peaks derived from bilayer-splitting are hidden in the well-known peak-dip-hump structure. In our group it was previously argued that an additional polarisation dependent double-peak structure arises in the one- and two-layer Bi-cuprate. In Bi(Pb)-2201 this can be traced unequivocally since there are no superstructure or bilayer effects possibly concealing this excitation. In Bi(Pb)-2212 the intensity ratio of the peak-dip-hump structure is energy dependent which could be a tool to uncover split excitations. In this contribution the photon energy dependence of the excitations near the Fermi energy of Bi(Pb)-2212 and Bi(Pb)-2201 is studied. (orig.)