One type of this process involves a "sphere of action" within which the probability of this process occurring is one, and other types include "parallax" and "depth-dependent."  If diffusion constants 
One type of this process involves a "sphere of action" within which the probability of this process occurring is one, and other types include "parallax" and "depth-dependent."  If diffusion constants and molecular radii are known, the efficiency of this process can be calculated using the (*) Smoluchowski equation.  Cyclodextrins and macromolecules protect against this process, and dithionite is one molecule that undergoes it.  It is often represented by a concave-up curve relating relative intensity on the y-axis to concentration on the x-axis; a plot named for Stern and Volmer.  For 10 points, name this process in fluorescent spectroscopy, in which the fluorescence intensity of a fluorescent sample decreases.
One type of this process involves a "sphere of action" within which the probability of this process occurring is one, and other types include "parallax" and "depth-dependent."  
{quenching} [accept word forms; grudgingly prompt on "fluorescence spectroscopy" until mentioned] (6) [DW]