Monolayer vibrational spectroscopy by infrared-visible sum generation at metal and semiconductor surfaces

Alex Harris, C. E D Chidsey, N. J. Levinos, D. N. Loiacono

Research output: Contribution to journalArticle

194 Citations (Scopus)


IR-visible sum generation spectroscopy, an interface-selective probe of molecular vibrations, is used to obtain vibrational spectra of molecular monolayers on metal and semiconductor surfaces. The spectra obey electric dipole selection rules: vibrational modes must be both Raman and infrared active to show sum frequency resonances. The orientation of molecules at the interface can be determined by interference between the resonant molecular signal and a substrate background signal. Sum generation is also observed at a buried interface in the absence of a dielectric discontinuity, suggesting uses at buried molecular structures such as polymer-polymer interfaces.

Original languageEnglish
Pages (from-to)350-356
Number of pages7
JournalChemical Physics Letters
Issue number4
Publication statusPublished - Nov 13 1987


ASJC Scopus subject areas

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

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