Electrolyte and Temperature Effects on Third-Order Susceptibility in Sum-Frequency Generation Spectroscopy of Aqueous Salt Solutions

Tatsuya Joutsuka, Akihiro Morita

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Sum-frequency generation (SFG) spectra from charged solid-liquid interfaces include significant contribution from third-order susceptibility χ(3), which mainly originates from induced water orientation in the electric double layer. We quantitatively evaluate the χ(3) susceptibility by molecular dynamics simulation in aqueous electrolyte solutions with varying concentrations and temperatures. We found that the value of χ(3) decreases with increasing concentration or temperature and that the perturbation on χ(3) is quite well-correlated with that on the dielectric constant ∈ of the solution. This correlation is understood as both quantities are commonly governed by the response of molecular orientation to the electric field. Accurate evaluation of χ(3) in various conditions is important in quantitative estimate of the third-order effect on the SFG spectroscopy, particularly in conditions of high surface charge and ion concentration.

Original languageEnglish
Pages (from-to)11407-11413
Number of pages7
JournalJournal of Physical Chemistry C
Volume122
Issue number21
DOIs
Publication statusPublished - 2018 May 31

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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