A plot of the @[email protected] @[email protected] of an excited molecular entity by a series of quenchers versus the @[email protected] energy of the quenchers. Alternatively, a plot of the @[email protected] for the @[email protected] of a reaction versus the @[email protected] energy of different sensitizers. This type of plot is used to estimate the energy of the excited molecular entity quenched (in the former case) or produced (in the latter case).