Appearance of coherent artifact signals in femtosecond transient absorption spectroscopy in dependence on detector design
✍ Scribed by B. Dietzek; T. Pascher; V. Sundström; A. Yartsev
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 248 KB
- Volume
- 4
- Category
- Article
- ISSN
- 1612-2011
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✦ Synopsis
The appearance of coherent artifact signals in transient
absorption spectroscopy employing a spectrally integrated
detection system is studied. The influence of the detection design
on the shape of the observed signal is detailed and the
experimentally very important case, in which the shape of the
coherent artifact is strongly influenced by the presence of the
sample itself, is considered – leading to the situation that the
artifact signal cannot be accounted for by simple comparison of
the kinetics obtained for the solvent only. Finally, an estimate
of the relative contribution of the artifact to the overall
transient absorption changes is presented facilitating the
interpretation of short time transients in the presence of
artifact contributions and allowing to estimate the excited state
absorption cross-section for a known pump-intensity dependence of
the artifact signal.