CH vibrational mode-softening in alkyl groups bound to Cu(111)

Jong-Liang Lin, Brian E. Bent

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

The surface vibrations of C1C3 alkyl groups bound to a Cu(111) surface have been studied by high resolution electron energy loss spectroscopy. The alkyl groups were generated by the dissociative adsorption of alkyl iodides and bromides. All of the adsorbed alkyls show CH stretching mode-softening, and isotope labelling studies indicate that the softened CH bonds are those at the α-carbon (the one bonded to the surface). Our results suggest that charge donation from the metal to the antibonding orbital of the alkyl groups is the cause of the CH stretching mode-softening.

Original languageEnglish
Pages (from-to)208-212
Number of pages5
JournalChemical Physics Letters
Volume194
Issue number3
DOIs
Publication statusPublished - 1992 Jun 26

Fingerprint

softening
vibration mode
methylidyne
Stretching
Electron energy loss spectroscopy
Iodides
Bromides
Isotopes
Labeling
iodides
marking
bromides
Carbon
isotopes
energy dissipation
Metals
electron energy
Adsorption
orbitals
vibration

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Surfaces and Interfaces

Cite this

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CH vibrational mode-softening in alkyl groups bound to Cu(111). / Lin, Jong-Liang; Bent, Brian E.

In: Chemical Physics Letters, Vol. 194, No. 3, 26.06.1992, p. 208-212.

Research output: Contribution to journalArticle

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Y1 - 1992/6/26

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AB - The surface vibrations of C1C3 alkyl groups bound to a Cu(111) surface have been studied by high resolution electron energy loss spectroscopy. The alkyl groups were generated by the dissociative adsorption of alkyl iodides and bromides. All of the adsorbed alkyls show CH stretching mode-softening, and isotope labelling studies indicate that the softened CH bonds are those at the α-carbon (the one bonded to the surface). Our results suggest that charge donation from the metal to the antibonding orbital of the alkyl groups is the cause of the CH stretching mode-softening.

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