Typical for the analysis of emission (or transient absorption) data. Upon excitation
with a particular
wavelength,
radiant intensity of the emission (or transient
absorbance difference) decays are observed as a function of a
variable parameter, e.g., the observation
wavelength, but otherwise under the same condition. All decays are then analysed together (globally)
under the constraint that the
lifetimes of the transient species do not vary with the
variable parameter, e.g., the observation
wavelength in the given example.
Lifetime-associated spectra (
LAS), also called decay-associated spectra (
DAS), are thus obtained. In the case of transient absorption data, the resulting spectra
are often called
lifetime-associated difference spectra (
LADS).
