COLL 274 |
| Yousoo Kim1, Chikako Matsumoto2, Toshiro Okawa2, Yasuyuki Sainoo1, Tadahiro Komeda3, and Maki Kawai1. (1) RIKEN, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan, (2) Gakushuin University, Tokyo, 171-8588, Japan, (3) Tohoku University, Sendai, 980-8577 |
| A low-temperature scanning tunneling microscope (STM) was used to control surface dynamics of C2H2 molecules adsorbed on Pd(111) single crystal surface at 4.7 K. STM images revealed six orientations of the molecule with respect to the substrate, indicating two different threefold hollow sites each with three possible rotational states. By injecting tunneling electrons into a single C2H2 molecule, rotational motion and lateral hopping motion were selectively induced depending on the energy of injected electrons. The dependence of yield per electron on applied electron energy shows clear threshold energies at ~ 150 meV and at ~370 meV, which correspond to (C-C) and (C-H) stretching vibrational modes, respectively. |
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Vibrational Analyses of Dry and Wet Surfaces
6:00 PM-8:00 PM, Monday, March 29, 2004 Disneyland -- North Exhibit Hall, Poster
Division of Colloid and Surface Chemistry |