Effect of rotational relaxation on the intensity and polarization of fluorescence emission caused by sequential two-photo excitation |
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Authors: | Hiroyasu Sato Masahiro Kawasaki Kazuo Kasatani |
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Institution: | Chemistry Department of Resources, Faculty of Engineering, Mi''e University, Tsu, 514 Japan |
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Abstract: | General formulas are derived for the intensity and the degree of polarization of the Sm-fluorescence emission (m ? 2) of a sample excited by the sequential two-photon excitation process (Sn ← S1 ← S0, n ? 2) with plane-polarized pulsed light. They show how the Sm-fluorescence intensity and anisotropy depend on the relative orientation of the relevant transition dipoles within a molecule and on the degree of rotational relaxation of molecules in the intermediate state (S1) and in the Sm state (for the case m = n), or in the Sn → Sm process (m ≠ n). |
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