One- and two-photon fluorescence anisotropy of selected fluorene derivatives

    Authors

    K. D. Belfield; M. V. Bondar; J. M. Hales; A. R. Morales; O. V. Przhonska;K. J. Schafer

    Comments

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    Abbreviated Journal Title

    J. Fluoresc.

    Keywords

    two-photon excitation anisotropy; steady-state fluorescence; transition; dipole moments; fluorene derivatives; HYDROCARBON REGION; CROSS-SECTIONS; EXCITATION; POLARIZATION; RELAXATION; ABSORPTION; MICROVISCOSITY; FLUOROPHORES; CHROMOPHORES; MOLECULES; Biochemical Research Methods; Chemistry, Analytical; Chemistry, Physical

    Abstract

    The steady-state excitation anisotropy spectra of fluorene derivatives were measured in viscous solvents, under the one- and two-photon excitation, over a broad spectral range (UV-Visible). The orientation of their absorption transition moments for the first, S-0 -- > S-1, and second, S-0 -- > S-2, excited states were determined. It was shown experimentally that a decrease in the angle between S-0 -- > S-1 and S-0 -- > S-2 transitions corresponded to an increased value of two-photon absorption (2PA) cross section for these molecules. Two-photon excitation anisotropy was nearly constant over the spectral region investigated (in contrast to one-photon excitation anisotropy spectra) and can be roughly explained by a simple model of 2PA based on the single intermediate state approximation. For comparison, the same trend in two-photon excitation anisotropy was observed for Rhodamine B in glycerol.

    Journal Title

    Journal of Fluorescence

    Volume

    15

    Issue/Number

    1

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    3

    Last Page

    11

    WOS Identifier

    WOS:000227216700002

    ISSN

    1053-0509

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