Rotational Spectromicroscopy: Imaging the Orbital Interaction between Molecular Hydrogen and an Adsorbed Molecule

Shaowei Li (李绍巍), Dingwang Yuan, Arthur Yu, Gregory Czap, Ruqian Wu, and W. Ho
Phys. Rev. Lett. 114, 206101 – Published 19 May 2015
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Abstract

A hydrogen molecule can diffuse freely on the surface and be trapped above an adsorbed molecule within the junction of a scanning tunneling microscope. The trapped dihydrogen exhibits the properties of a free rotor. Here we show that the intermolecular interaction between dihydrogen and Mg-porphyrin (MgP) can be visualized by imaging j=0 to 2 rotational excitation of dihydrogen. The interaction leads to a weakened H-H bond and modest electron donation from the dihydrogen to the lowest unoccupied molecular orbital of MgP, a process similarly observed for the interaction between dihydrogen and an adsorbed Au atom.

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  • Received 12 February 2015

DOI:https://doi.org/10.1103/PhysRevLett.114.206101

© 2015 American Physical Society

Authors & Affiliations

Shaowei Li (李绍巍)1, Dingwang Yuan1,2, Arthur Yu1, Gregory Czap1, Ruqian Wu1, and W. Ho1,3,*

  • 1Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA
  • 2College of Materials Science and Engineering, Hunan University, ChangSha 410082, China
  • 3Department of Chemistry, University of California, Irvine, California 92697-2025, USA

  • *To whom correspondence should be addressed. wilsonho@uci.edu wur@uci.edu

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Vol. 114, Iss. 20 — 22 May 2015

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