Directory
Prof. Rainer BECK
| When |
May 20, 2014 à 10:30 AM |
|---|---|
| Where |
Salle des thèses |
| Contact |
Wei DONG |
State-resolved gas/surface reactivity: probing the role of vibration in dissociative chemisorption
This talk will review recent results from our laboratory on quantum state resolved reactivity measurements for the dissociative chemisorption of methane and water (and its deuterated isotopologues) on Ni and Pt surfaces. Using state-selective reactant preparation by infrared pumping in a molecular beam, we prepare the incident methane molecules in a specific ro-vibrational quantum state and measure the state-resolved reactivity on a single crystal surface using surface analytical techniques such Auger electron spectroscopy, King & Wells beam reflectivity, and reflection absorption infrared spectroscopy of the surface bound reaction products. The results of our measurements provide evidence for mode- and bond-specificity as well as steric effects, which show that chemisorption reactions cannot be described by statistical rate theory but require a dynamical model including all internal degrees of freedom of the dissociating molecule.