Scanning tunneling microscopy observation of CO on Pd(110) at cryogenic temperature; Imaging mechanism and novel one-dimensional array formation

T. Komeda, Y. Kim, M. Kawai

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Scanning tunneling microscopy (STM) is used to observe carbon monoxide (CO) on Pd(110) surface at cryogenic temperature. We observe the change of appearance of CO in the STM images with the variation of bias voltage and also the existence of CO on the tip apex. This is well explained by assuming a V-shaped density of states at O atom which is formed by the mixing of CO 2π* and Pd 4d. An intriguing one-dimensional ordering is observed along the [110] direction, when CO is dosed at RT and observed at 4.8 K even at coverages less than 0.1 ML. The CO spacing is twice the Pd lattice spacing. The diffusion in such arrays is observed above 110 K. It is found that the diffusion of CO molecules is anisotropic and practically restricted along a single Pd row; inter-row hopping is hardly observed. It is observed that CO molecules in longer chains are more stable than isolated CO molecules.

Original languageEnglish
Pages (from-to)4403-4408
Number of pages6
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume40
Issue number6 B
DOIs
Publication statusPublished - 2001 Jun
Externally publishedYes

Keywords

  • Gas adsorption
  • Imaging mechanism
  • Low-temperature STM
  • Metal surface
  • STM

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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