Abstract
Scanning tunneling microscope images of isolated molecules of trans-2-butene (C4H8) and 1,3-butadiene (C4H6) adsorbed on the Pd(1 1 0) surface are presented at 4.7 K. The former appears as a dumbbell-shaped protrusion perpendicular to the Pd row, while the latter appears as an elliptical protrusion parallel to the Pd row. By dosing tunneling electrons, the trans-2-butene molecule is transformed into a 1,3-butadiene molecule via dehydrogenation reaction. The threshold voltage (∼365 mV) is so small that the electronic excitation to the C-H antibonding state cannot be attributed to the mechanism. Instead, we consider that the multiple excitation of C-H stretching mode by inelastically tunneled electron is responsible for the dehydrogenation.
Original language | English |
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Pages (from-to) | 7-11 |
Number of pages | 5 |
Journal | Surface Science |
Volume | 502-503 |
DOIs | |
Publication status | Published - 2002 Apr 10 |
Externally published | Yes |
Keywords
- Adsorption kinetics
- Alkenes
- Palladium
- Scanning tunneling microscopy
- Surface chemical reaction
- Tunneling
ASJC Scopus subject areas
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry