Intra-dimer row and inter-dimer row coupling of the vibrational modes of chemisorbed CO on Si(001)-c(4×2) observed by angle-dependent transmission infrared spectroscopy

Shinya Ohno; Shotaro Shimizu; Kazuma Tanaka; Shinya Yoshimoto; Jun Yoshinobu

doi:10.1063/1.5109950

Intra-dimer row and inter-dimer row coupling of the vibrational modes of chemisorbed CO on Si(001)-c(4×2) observed by angle-dependent transmission infrared spectroscopy

J Chem Phys. 2019 Aug 21;151(7):074702. doi: 10.1063/1.5109950.

Authors

Shinya Ohno¹, Shotaro Shimizu¹, Kazuma Tanaka¹, Shinya Yoshimoto², Jun Yoshinobu²

Affiliations

¹ Graduate School of Engineering, Yokohama National University, Yokohama, Japan.
² The Institute for Solid State Physics, The University of Tokyo, Chiba, Japan.

PMID: 31438706
DOI: 10.1063/1.5109950

Abstract

The vibrational modes of chemisorbed CO on a Si(001) surface are investigated by means of transmission Fourier-transform infrared absorption spectroscopy. We observed the three components corresponding to the stretching vibration of the terminal-site CO adsorbed on the down-dimer sites of a Si(001) surface. The symmetric stretching vibration and asymmetric stretching vibration are observed separately. This assignment is consistent with the polarization dependence of the incident light and with the vibrational modes obtained by performing theoretical calculations. We found that both the intradimer row and interdimer row coupling should be considered to explain the appearance of the three components.