We have compared the metallic evaporation channels from metastable [Ag-X=5,Ag-7,Ag-11(AgI)(Y=1-4)](+) clusters in the first field free region of a double focusing mass spectrometer with that of the corresponding pure metallic clusters, [Ag-X=5,Ag-7,Ag-11](+). It is found that the presence of the polar AgI molecules increases the rate of silver monomer evaporation relative to that of silver dimer evaporation. Using thermodynamic expressions for the heat of evaporation of the different evaporation processes and assuming the absence of reverse activation energies, an expression for the difference between the activation energy of silver monomer and dimer evaporation is derived. It is shown that dipole/induced-dipole forces resulting from the presence of AgI polar molecules lead to an enhancement of silver monomer evaporation if the polarizability of the pure metallic cluster ions increases with the number of Jellium electrons. Our theoretical calculations of the static polarizabilities of [Ag-x](+), using time dependent density functional theory within the local density approximation, shows a smooth increase in the polarizabilities with the number of the Jellium electrons in these clusters. Finally, we observe that the enhancement of Ag monomer evaporation per AgI needed is smaller for clusters with an even number of AgI molecules than with an odd number of them. This was proposed to result from the contribution of configurations with dipole "pairing" of the AgI molecules in clusters with an even number of AgI molecules, Dipole pairing would decrease the average dipole/induced-dipole interaction between the AgI molecules and the metallic part of these "mixed" clusters.