研究・研究者
研究会・セミナー
| 演 題 | 「走査型プローブ顕微鏡による一酸化炭素分子の精密振動分光」"Precise vibrational spectroscopy of a single CO molecule" |
|---|---|
| 日 時 | 2019年04月23日(火) 16:30 |
| 講演者 | 岡林則夫 助教（金沢大学理工研究域 数物科学系） |
| 場 所 | 分子科学研究所 研究棟2階201号室 |
| 概 要 |
The vibration of a molecule on a surface contains critical information on the bond of the molecule with the surface and within the molecule. Combination of scanning tunneling microscopy (STM) with inelastic electron tunneling spectroscopy (IETS) enable us to investigate vibrational energies at the atomic scale precision [1]. However, it has been known that the intensity of IETS strongly changes between different tips [2] and the vibrational energies acquired by IETS are strongly influenced by the distance between the tip and molecule [3,4], i.e., the force from the tip to the molecule. In order to clear these problems, we have incorporated atomic force microscopy (AFM) into STM-IETS by collaboration with Franz Giessibl laboratory in Regensburg University. By this improvement, we have found that a metallic tip whose apex consists of a single atom provides the stronger IETS signal to a CO molecule on a Cu(111) surface, whereas a metallic tip whose apex consists of multiple atoms provides the smaller IETS signal [5]. We have further found that the higher the tip-molecule interaction, the more the vibrational modes of the molecule are perturbed. These findings have been rationalized by a classical model describing the molecule vibration as a double pendulum, where the presence of the tip weakens the tip-surface chemical bond [6].
[1] B. C. Stipe, M. A. Rezaei, and W. Ho, Science 280, 1732 (1998). |
| その他 |
所内対応者：杉本 敏樹（物質分子科学研究領域） |
