Polarization and surface density dependence of pyrenehexadecanoic acid at the air-water interface under compression studied by a laser two-photon ionization technique

Miki Sato, Hiromi Akagishi, Akira Harata, Teiichiro Ogawa

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    Orientation of pyrenehexadecanoic acid (PyHA) on the water surface has been investigated using surface compression, fluorescence spectra, and two-photon ionization measurements. PyHA stays as a monomer at surface densities lower than 0.025 nmol/cm2, while at high surface densities excimer emission was observed. The two-photon ionization signal had a peak at 90° (p-polarized laser beam) upon the rotation of the polarization of the incident laser beam. The difference in the signal intensity generated by p-polarized and s-polarized lights became smaller as surface density increased. It is suggested that the tilt angle of the transition moment of the pyrene ring is ca. 70° at a low surface density, and it increases with the surface density increase. Problems in determining orientation of the molecules on water are discussed.

    Original languageEnglish
    Pages (from-to)8167-8171
    Number of pages5
    JournalLangmuir
    Volume17
    Issue number26
    DOIs
    Publication statusPublished - Dec 25 2001

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Condensed Matter Physics
    • Surfaces and Interfaces
    • Spectroscopy
    • Electrochemistry

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