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Schematic illustrations of the IETS measurement. The cross-sections for the elastic and inelastic tunneling are (to a first, rough approximation) additive, so that when the applied voltage exceeds a characteristic vibrational energy on the molecule, one expects to see changes of slope in the current, of value in the conductance, and peaks in the IETS (second derivative of the current) structure (M. A. Reed, personal communication).
