excited state absorption

Excited state absorption (ESA) is the absorption of a photon from a lower excited state to a higher excited state of an atom, molecule or ion. Excited-state absorption can occur only after an electron has already been excited to the lower excited state. The lower excited state has a higher energy than the ground state level and the higher excited state is higher in energy than the lower excited state. Excited-state absorption from the first excited state is illustrated in the diagram below.

excited state absorption

This corresponds to the following Jablonski energy level diagram

excited state absorption

See also: Single-photon absorption, Relaxation.

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SimphoSOFT® case study of excited-state single-photon absorption in a chromophore AF455.

Video describing how to build energy level diagram for optical limiter, containing single- and two-photon absorption transitions, and how to optimize its performance in SimphoSOFT®.
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