Rotamers do not equilibrate after interacting with these species according to the NEER principle. Interaction (10[1])with these species allows Ru(bpy)3 (“roo-bippy-three”) to transfer single electrons. (10[1])After interacting with these species, volume-constrained molecules like stilbene can rearrange through a hula-twist mechanism. (10[1])Each instance of these species can only interact with one molecule at a time according to the Stark–Einstein (10[1])law. (10[1]-5[1])The proportion of these species (-5[1])that are absorbed into a given substance is measured by that substance’s quantum yield. (10[4])Addition of these species (10[1])to a reaction (10[2]-5[1])is often abbreviated “h nu” (10[3]-5[1])in reference to (10[1])their (10[1])energy. (10[4])For 10 points, (10[1])photochemistry studies the interaction (10[3])between (-5[1])molecules (10[3])and what (10[1])quanta (10[3])of (10[2])light? (10[2])■END■ (10[9])