The high temperature superconductors T12Ba2CuO6 +,~ (TI-2201) and T12Ba2Ca2Cu3Olo (T1-2223) with one and three CuO2 planes were investigated by Raman scattering in order to see whether the electronic Raman scattering crosssection depends on the number of CuO2 planes, i.e. sheets of the Fermi surface. We present measurements of polarized Raman spectra in different scattering geometries on two single crystals of T1-2201 (To = 90 K, 80 K), and one single crystal of T1-2223 (To = 118K), for temperatures below and above To. In Big-symmetry the peak in the electronic Raman scattering is found at 460 cm-1(To = 90 K), or 430cm-1 (T~ = 80 K) for T1-2201 and at 610 cm-1 for T1-2223. This corresponds to 2A/kBT¢ = 7.4 + 0.4 for both compounds. The Alg-and B2g-symmetry components show smaller values for the peak position and a decrease linear in co of the scattering intensity towards lower frequencies. The Bl~-component shows a decrease cubic in co of the scattering intensity towards lower frequencies.
The spectral features of TI-2201 and T1-2223 are found to be independent of the number of CuO2-planes, i.e. of specific details of the Fermi surface. These observations are similar to the measurements on over-and underdoped Bi2Sr2CaCu208+~ single crystals. They are consistent with a d~2 y2-wave pairing mechanism, based on the theoretical model of Devereaux and Einzel.