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Science 15 March 2002:
Vol. 295. no. 5562, pp. 2055 - 2058
DOI: 10.1126/science.1069016
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Reports

Lateral Hopping of Molecules Induced by Excitation of Internal Vibration Mode

T. Komeda,1 Y. Kim,1 Maki Kawai,1* B. N. J. Persson,2 H. Ueba3

We demonstrate electron-stimulated migration for carbon monoxide (CO) molecules adsorbed on the Pd(110) surface, which is initiated by the excitation of a high-frequency (HF) vibrational mode (C-O stretching mode) with inelastic tunneling electrons from the tip of scanning tunneling microscopy. The hopping phenomenon, however, cannot be detected for CO/Cu(110), even though the hopping barrier is lower than in the CO/Pd(110) case. A theoretical model, which is based on the anharmonic coupling between low-frequency modes (the hindered-translational mode related to the lateral hopping) and the HF mode combined with electron-hole pair excitation, can explain why the hopping of CO is observed on Pd(110) but not on Cu(110).

1 RIKEN, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
2 IFF, FZ-Jülich, 52425, Jülich, Germany.
3 Department of Electronics, Toyama University, Gofuku, Toyama, Japan.
*   To whom correspondence should be addressed. E-mail: maki{at}postman.riken.go.jp

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Science. ISSN 0036-8075 (print), 1095-9203 (online)