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

    研究成果: Contribution to journalArticle査読

    3 被引用数 (Scopus)

    抄録

    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.

    本文言語英語
    ページ(範囲)8167-8171
    ページ数5
    ジャーナルLangmuir
    17
    26
    DOI
    出版ステータス出版済み - 12 25 2001

    All Science Journal Classification (ASJC) codes

    • 材料科学(全般)
    • 凝縮系物理学
    • 表面および界面
    • 分光学
    • 電気化学

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