## residual emission anisotropy

https://doi.org/10.1351/goldbook.RT07473
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 @[email protected] does not decay to zero but to a steady value, $$r_{\mathrm{\infty }}$$, called residual @[email protected] In the case of a single rotational correlation time, $$\tau _{\mathrm{c}}$$ or $$\theta$$, the decay of @[email protected] 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 @[email protected]
Note:
The term residual @[email protected] is to be preferred to 'limiting @[email protected]'.
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 414 [Terms] [Paper]