spectral overlap

https://doi.org/10.1351/goldbook.S05818
In the context of
radiative energy transfer
, the integral, Math input error, which measures the overlap of the
emission spectrum
of the excited donor, D, and the
absorption spectrum
of the
ground state
acceptor, A; fD is the measured normalized emission of D, fD=fD(σ)0fD(σ) dσ, fD(σ) is the
photon exitance
of the donor at wavenumber σ, and Math input error is the decadic
molar absorption coefficient
of A at wavenumber σ. In the context of
Förster excitation transfer
, J is given by: Math input error In the context of
Dexter excitation transfer
, J is given by: Math input error In this case fD and Math input error, the
emission spectrum
of donor and
absorption spectrum
of acceptor, respectively, are both normalized to unity, so that the
rate constant
for energy transfer, kET, is independent of the
oscillator strength
of both transitions (contrast to Förster mechanism).
See:
energy transfer (in photochemistry)
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2275 [Terms] [Paper]