FIG. 1: (Color online) The spectrum of the effective permittivity of a suspension of dimers with various junction thickness h , and with parallel and perpendicular field configurations. The sus- pension permittivity for an electric field perpendicular to cluster axis does not depend on h and is pointed by an arrow. small h , this dipole active eigenmode approaches 1/2 as the junction becomes tighter. Thus, according to equations (27) and (28) the effect of χ$_{2}$ is “enhanced” due to the presence of a nonconductive shell (as the case for biological particles analyzed in [3, 25]). Moreover, the decrease of P$_{2}$$_{,}$$_{1}$ is compensated by the increase of 1 / (1 / 2 − χ$_{2}$ ). The presence of a new relaxation at low frequency along with its relationship with the size of h has been already singled out in Gheorghiu et al. [25] by using the same method but without the analysis of dipole-active eigenmodes. Using a finite discrete model [3], the relaxation was observed before the segregation during cell division, while other papers [34, 35] fail to relate the size of h to the new relaxation, even though one of them [34] employs essentially the same method as the one outlined in the present work. Figure 3 shows the charge distribution associated with the first four eigenvalues for two distinct values of h . The second eigenmode is an antisymmetric combination of net charge distributions (monopoles) on each particle of the dimer. The third charge distribution is an antisymmetric combination of charge distributions with a dipole moment on each part of the 15 GLYPH<s49>GLYPH<s48> GLYPH<s49> GLYPH<s49>GLYPH<s48> GLYPH<s50> GLYPH<s49>GLYPH<s48> GLYPH<s51> GLYPH<s49>GLYPH<s48> GLYPH<s52> GLYPH<s49>GLYPH<s48> GLYPH<s53> GLYPH<s49>GLYPH<s48> GLYPH<s54> GLYPH<s49>GLYPH<s48> GLYPH<s55> GLYPH<s49>GLYPH<s48> GLYPH<s56> GLYPH<s49>GLYPH<s48> GLYPH<s57> GLYPH<s49>GLYPH<s48> GLYPH<s49>GLYPH<s48> GLYPH<s48> GLYPH<s49>GLYPH<s48>GLYPH<s48> GLYPH<s50>GLYPH<s48>GLYPH<s48> GLYPH<s51>GLYPH<s48>GLYPH<s48> GLYPH<s52>GLYPH<s48>GLYPH<s48> GLYPH<s53>GLYPH<s48>GLYPH<s48> GLYPH<s112> GLYPH<s97> GLYPH<s114> GLYPH<s44> GLYPH<s112> GLYPH<s101> GLYPH<s114>GLYPH<s112> GLYPH<s102>GLYPH<s40>GLYPH<s72>GLYPH<s122>GLYPH<s41> GLYPH<s32>GLYPH<s104>GLYPH<s61>GLYPH<s48>GLYPH<s46>GLYPH<s53> GLYPH<s32>GLYPH<s104>GLYPH<s61>GLYPH<s48>GLYPH<s46>GLYPH<s49> GLYPH<s32>GLYPH<s104>GLYPH<s61>GLYPH<s48>GLYPH<s46>GLYPH<s48>GLYPH<s49> GLYPH<s32>GLYPH<s104>GLYPH<s61>GLYPH<s48>GLYPH<s46>GLYPH<s48>GLYPH<s48>GLYPH<s49> GLYPH<s112>GLYPH<s101>GLYPH<s114>GLYPH<s112>