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Phys. Rev. B 75, 174306 (2007) [8 pages]

A priori method for propensity rules for inelastic electron tunneling spectroscopy of single-molecule conduction

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Alessio Gagliardi1,2, Gemma C. Solomon3,6, Alessandro Pecchia4, Thomas Frauenheim1, Aldo Di Carlo4, Noel S. Hush5,6, and Jeffrey R. Reimers6
1Bremen Center for Computational Materials Science, University of Bremen, D-28359, Germany
2PaSCO Graduate School, University of Paderborn, D-33098 Paderborn, Germany
3Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA
4CNR-INFM Dep. of Electronics Engineering, University of Rome “Tor Vergata,” Via del Politecnico 1, 00133, Italy
5School of Molecular and Microbial Biosciences, The University of Sydney, Sydney, New South Wales 2006, Australia
6School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia

Received 8 January 2007; revised 18 February 2007; published 25 May 2007

An a priori computational method for determining intensities in inelastic electron tunneling spectroscopy (IETS) is developed that allows simple, chemically intuitive propensity rules to be obtained for arbitrary applications. The molecule is shown to scatter charges between quite specific eigenchannels of lead-coupling-weighted molecular density of states. This allows mode-specific scattering sites to be identified within the molecule, indicating how external chemical or other perturbations could be used to control IETS intensities.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.174306
DOI:
10.1103/PhysRevB.75.174306
PACS:
72.10.Bg, 72.90.+y