Photothermal lensing signal enhancement by the transient absorption of photoexcited states in liquid solutions

Akira Harata, N. Yamaguchi

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    A two-color double-pulse excited photothermal lensing measurement was performed to investigate a signal enhancement owing to transient absorption by the excited states of solute molecules in liquid solutions. A colinear, mode-mismatched configuration with a continuous-wave probe laser at 633 nm was adapted with a focused pump pulse (6.9 ns, 355 nm) and a sequentially incident softly focused second-pump pulse (7.2 ns, 532 nm). The signal-intensity dependence on the energies of the pump and the second-pump pulses was measured for 1.0 μM solutions of 2,2'-p-phenylenebis(5-phenyloxazole) in 1-butanol and anthracene in ethanol. A signal enhancement was observed for both solutions. The signal intensity under certain conditions was one order higher than that expected from ground-state absorption. A discussion was made on determination of the absorption coefficient of the transient species and on the absorption saturation of the ground and excited states.

    Original languageEnglish
    Pages (from-to)743-749
    Number of pages7
    Journalanalytical sciences
    Volume16
    Issue number7
    DOIs
    Publication statusPublished - Jan 1 2000

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    Pumps
    Liquids
    Excited states
    Ground state
    1-Butanol
    Laser modes
    Ethanol
    Color
    Molecules
    Lasers
    anthracene

    All Science Journal Classification (ASJC) codes

    • Analytical Chemistry

    Cite this

    Photothermal lensing signal enhancement by the transient absorption of photoexcited states in liquid solutions. / Harata, Akira; Yamaguchi, N.

    In: analytical sciences, Vol. 16, No. 7, 01.01.2000, p. 743-749.

    Research output: Contribution to journalArticle

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