We show that vibrational energy can be used to tune the chemisorption state of an adsorbed molecule. When dosing C2H4 with a supersonic molecular beam on Ag(0 0 1) we demonstrate by vibrational spectroscopy that, with increasing nozzle temperature, TN, firstly no stable adsorption occurs, then a pi -bonded configuration is populated, switching finally to a more strongly, undissociated, di-sigma -bonded state. Direct dissociation is observed at still higher T-N with the formation of dehydrogenated radicals
Switching from molecular to dissociative adsorption with vibrational energy: ethylene on Ag(001)
VATTUONE, LUCA;SAVIO, LETIZIA;VALBUSA, UGO;ROCCA, MARIO AGOSTINO
2000-01-01
Abstract
We show that vibrational energy can be used to tune the chemisorption state of an adsorbed molecule. When dosing C2H4 with a supersonic molecular beam on Ag(0 0 1) we demonstrate by vibrational spectroscopy that, with increasing nozzle temperature, TN, firstly no stable adsorption occurs, then a pi -bonded configuration is populated, switching finally to a more strongly, undissociated, di-sigma -bonded state. Direct dissociation is observed at still higher T-N with the formation of dehydrogenated radicals
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