Preferred Label : residual emission anisotropy;
IUPAC definition : Photoselected molecules hindered in their rotation (e.g., in lipid bilayers or liquid
crystals) do not become randomly oriented even after long time periods. Thus, the
emission anisotropy does not decay to zero but to a steady value, r , called residual
emission anisotropy. In the case of a single rotational correlation time, τ c or θ,
the decay of emission anisotropy following δ-pulse excitation is given by: \[r\left(t\right)
(r_{0}- r_{\mathrm{\infty }})\ \exp (- \frac{t}{\tau _{\mathrm{c}}}) r_{\mathrm{\infty
}}\] where r 0 is the fundamental emission anisotropy.;
Scope note : the term residual anisotropy is to be preferred to limiting anisotropy.;
Origin ID : RT07473;
See also
Photoselected molecules hindered in their rotation (e.g., in lipid bilayers or liquid
crystals) do not become randomly oriented even after long time periods. Thus, the
emission anisotropy does not decay to zero but to a steady value, r , called residual
emission anisotropy. In the case of a single rotational correlation time, τ c or θ,
the decay of emission anisotropy following δ-pulse excitation is given by: \[r\left(t\right)
(r_{0}- r_{\mathrm{\infty }})\ \exp (- \frac{t}{\tau _{\mathrm{c}}}) r_{\mathrm{\infty
}}\] where r 0 is the fundamental emission anisotropy.
