期刊
JOURNAL OF CHEMICAL PHYSICS
卷 155, 期 16, 页码 -出版社
AIP Publishing
DOI: 10.1063/5.0065460
关键词
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资金
- ESPRC Doctoral Training Partnership [EP/R513039/1]
The study demonstrates the successful application of optical Kerr gating to overcome fluorescence interference in studying the excited state dynamics of molecules at interfaces using second-order non-linear spectroscopic methods. This new approach has been shown to be effective in discriminating against fluorescence signals in various systems.
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.
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