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Increasing Pump-Probe Signal toward Asymptotic Limits
Journal article   Open access   Peer reviewed

Increasing Pump-Probe Signal toward Asymptotic Limits

Kevin C Robben and Christopher M Cheatum
The journal of physical chemistry. B, Vol.127(21), pp.4694-4707
06/01/2023
DOI: 10.1021/acs.jpcb.3c01270
PMCID: PMC10240498
PMID: 37200488
Appears in  UI Libraries Support Open Access
url
https://doi.org/10.1021/acs.jpcb.3c01270View
Published (Version of record) Open Access

Abstract

Optimization of pump-probe signal requires a complete understanding of how signal scales with experimental factors. In simple systems, signal scales quadratically with molar absorptivity, and linearly with fluence, concentration, and path length. In practice, scaling factors weaken beyond certain thresholds (e.g., OD > 0.1) due to asymptotic limits related to optical density, fluence and path length. While computational models can accurately account for subdued scaling, quantitative explanations often appear quite technical in the literature. This Perspective aims to present a simpler understanding of the subject with concise formulas for estimating absolute magnitudes of signal under both ordinary and asymptotic scaling conditions. This formulation may be more appealing for spectroscopists seeking rough estimates of signal or relative comparisons. We identify scaling dependencies of signal with respect to experimental parameters and discuss applications for improving signal under broad conditions. We also review other signal enhancement methods, such as local-oscillator attenuation and plasmonic enhancement, and discuss respective benefits and challenges regarding asymptotic limits that signal cannot exceed.
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