単一分子の振動励起による表面ダイナミクスの制御―Ｐｄ（１１１）上のアセチレン分子―

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書誌事項

タイトル別名
  • Controlling Surface Dynamics by Vibrational Excitation of a Single Molecule-Acetylene Molecules on Pd(111)-
  • タンイツ ブンシ ノ シンドウレイキ ニ ヨル ヒョウメン ダイナミクス ノ セイギョ Pd 111 ジョウ ノ アセチレン ブンシ
  • —Acetylene Molecules on Pd(111)—
  • —Pd(111)上のアセチレン分子—

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抄録

We report the control of surface dynamics of individual acetylene molecules on Pd(111) at 4.7 K, which involves (1) determination of adsorption sites of the molecules, and (2) inducing rotational and hopping motions of acetylene by excitation of specific vibrational modes through inelastic electron tunneling process. Topographic STM images of an acetylene molecule on the Pd(111) surface revealed that the molecule occupies the 3-fold hollow site as the most stable adsorption site. When the tunneling electrons were injected, the molecule rotated among three equivalent orientations with two threshold voltages at ∼150 mV (∼150 mV) and at ∼370 mV (∼280 mV) for C2H2 (C2D2), which correspond to C-C and C-H stretch modes. On the other hand, when the higher electron energy was applied, the molecule showed lateral hopping motion to the adjacent site in addition to rotational motion. The threshold was obtained at ∼370 mV (∼280 mV) for C2H2 (C2D2). The apparent energy dependence of the efficiency of the dynamic motions and the strong isotopic shift indicate that we can control the rotational and hopping motions by the excitation of specific vibrational modes of a single acetylene molecule.

収録刊行物

  • 表面科学

    表面科学 25 (9), 573-579, 2004

    公益社団法人 日本表面科学会

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