Artifact-free balanced detection for the measurement of circular dichroism with a sub-picosecond time resolution
Résumé
Here we present the development of a subpicosecond spectropolarimeter enabling high sensitivity balanced detection of time-resolved circular dichroism (TRCD) signals from chiral sample in solution. The signals are measured with a conventional femtosecond pump-probe set-up using the combination of a quarter-waveplate and a Wollaston prism. This simple and robust method allows access to TRCD signals with improved signal-to-noise ratio and very short acquisition times. We provide a theoretical analysis of the artifacts of such detection geometry and the strategy to eliminate them. We illustrate the potential of this new detection with the study of the [Ru(phen) 3 ]·2PF 6 complexes in acetonitrile.
Domaines
Physique [physics]
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Ms-Balanced detection-revision-final.pdf (1.44 Mo)
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Supplementary information-revision final.pdf (235.17 Ko)
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