Preferred Label : pump-probe technique;
IUPAC definition : Transient absorption spectroscopy using two pulses (strong pump and weak probe) and
capable of achieving a high temporal resolution. A u pump /u pulse excites the sample
and triggers the process under investigation. A second delayed pulse, the u probe
/u i , /i monitors an optical property. By varying the time delay between the pump
and probe pulses, it is possible to assemble measurements as a function of time. The
probe pulse is typically a UV, visible or infrared pulse in which case a snap-shot
spectrum is taken as a function of the delay time. Often the probe pulse is generated
from a portion of the excitation beam, but it can also be an independently generated
electromagnetic pulse.;
Scope note : in the case of an optical probe, this interaction is formally a non-linear optical
process that is third-order in polarization. the excitation intensity to create the
excited state constitutes a two-field interaction and the determination of the change
in the time-dependent optical properties involves a third field monitoring the induced
time-dependent changes in the linear susceptibility. diffractive probes (e.g., electrons
and x-rays) can also be used, in which case one measures a diffraction pattern as
a function of time.;
Origin ID : P04952;
See also
Transient absorption spectroscopy using two pulses (strong pump and weak probe) and
capable of achieving a high temporal resolution. A u pump /u pulse excites the sample
and triggers the process under investigation. A second delayed pulse, the u probe
/u i , /i monitors an optical property. By varying the time delay between the pump
and probe pulses, it is possible to assemble measurements as a function of time. The
probe pulse is typically a UV, visible or infrared pulse in which case a snap-shot
spectrum is taken as a function of the delay time. Often the probe pulse is generated
from a portion of the excitation beam, but it can also be an independently generated
electromagnetic pulse.
