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dis s o hat e p hro 2007 Elsevier B.V. All rights reserved. as a well-defined structural model mimicking the crossing considerations may be highly relevant for the design of a molecular based switching devices [11]. Seferos et al., have the conductance (dI/dV) and current-induced fluorescence chemical modification of the molecular bridge. 2. Methodology We consider a tunneling junction consisting of a molec-ular bridge weakly coupled to two (left and right) metallic * Corresponding author