Table of Contents
Surfaces, Volume 2, Issue 1 (March 2019)
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Cover Story (view full-size image) Energy transfer between excited electrons and adsorbate vibrational modes is behind surface [...] Read more. Energy transfer between excited electrons and adsorbate vibrational modes is behind surface dynamics such as diffusion, desorption, and reaction. Here, we tune this energy transfer by decoupling CO from the Cu(110) surface with a metalloporphyrin. An ultrafast green pump pulse excites electrons into the CO 2π if CO binds directly to Cu(110), and infrared–visible sum frequency generation detects CO bond weakening as a frequency redshift. For CO coordinated to the metalloporphyrin, the 2π state is too high in energy and the observed frequency blueshift is caused by electron-mediated vibrational mode coupling. This is depicted below using the example of a PhD celebratory chocolate cake. View Paper here.