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Time-resolved electronic sum-frequency generation spectroscopy with fluorescence suppression using optical Kerr gating

Jordan, Caleb J. C. and Verlet, Jan R. R. (2021) 'Time-resolved electronic sum-frequency generation spectroscopy with fluorescence suppression using optical Kerr gating.', Journal of chemical physics., 155 (16). p. 164202.

Abstract

Excited state dynamics of molecules at interfaces can be studied using second-order non-linear spectroscopic methods such as time-resolved electronic sum-frequency generation (SFG). However, as such measurements inherently generate very small signals, they are often overwhelmed by signals originating from fluorescence. Here, this limitation is overcome by optical Kerr gating of the SFG signal to discriminate against fluorescence. The new approach is demonstrated on the excited state dynamics of malachite green at the water/air interface, in the presence of a highly fluorescent coumarin dye, and on the photo-oxidation of the phenolate anion at the water/air interface. The generality of the use of optical Kerr gating to SFG measurements is discussed.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Available under License - Creative Commons Attribution 4.0.
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1063/5.0065460
Publisher statement:© 2021 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). h
Date accepted:12 October 2021
Date deposited:11 January 2022
Date of first online publication:27 October 2021
Date first made open access:11 January 2022

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