Journal
APPLIED SPECTROSCOPY
Volume 64, Issue 9, Pages 1037-1044Publisher
SAGE PUBLICATIONS INC
DOI: 10.1366/000370210792434369
Keywords
Transient; Vibrational echo; Ultrafast; Infrared spectroscopy; Nonlinear spectroscopy
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Funding
- National Science Foundation [CHE-0748501]
- University of Michigan
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [748501] Funding Source: National Science Foundation
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Transient dispersed vibrational echo (DYE) spectroscopy is a practical alternative to transient-absorption spectroscopy because it affords increased sensitivity as well as greater signal-to-noise ratio without the need to detect a reference spectrum. However, as a third-order nonlinear probe, the extraction of kinetic information from transient-DVE is somewhat cumbersome compared to transient absorption. This article provides a direct experimental and theoretical comparison between transient-absorption and transient-DVE measurements and presents a framework for analyzing kinetic measurements while exploring the implications or making some simplifying assumptions in the data analysis. The equations for computing the signal-to-noise ratios under different experimental conditions are derived and used in the analysis of the experimental data. The results, obtained under the same experimental conditions, show that for a relatively strong terminal carbonyl stretching mode, signal-to-noise ratios in transient-DVE spectroscopy are approximately 2.5 times greater than transient absorption. The experimental results along with the theoretical models indicate that transient-DVE could become an attractive alternative to transient-absorption spectroscopy for measuring the kinetics of light-induced processes.
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