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We report clear evidence of the role of dipole-dipole interaction in Penningionization of Rydberg atoms, leading to the formation of an ultracold plasma.Penning ionization of np Rydberg Cesium atoms is prevented for states with in n< 42, which correspond to a repulsive potential, but it does not occur for nlarger than 42, corresponding to an attractive potential. Blackbody radiationis mostly responsible for the background and initial ionization, althoughion-Rydberg collisions and population transfer due to limited superradiance mayhave to be considered.

Ionization in a frozen Rydberg gas with attractive or repulsive potentials