Strongly coverage-dependent excitations of adsorbed molecular hydrogen

J. A. Gupta, C. P. Lutz, A. J. Heinrich, D. M. Eigler

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We have observed prominent nonlinearities in differential conductance spectra of H 2 on copper surfaces using a low-temperature scanning tunneling microscope. These nonlinearities result from transitions between states of H 2 with distinct conductances. Tunneling electrons drive these transitions by giving up energy to highly coverage-dependent excitations that do not correspond to known vibrational or rotational modes of H 2. The nonlinear conductance features can be modeled by extending the conventional framework for inelastic electron tunneling spectroscopy to include saturation effects.

Original languageEnglish
Article number115416
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number11
StatePublished - 15 Mar 2005


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