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• W2739878895 endingPage "18950" @default.
• W2739878895 startingPage "18950" @default.
• W2739878895 abstract "Two-dimensional electronic spectroscopy (2DES) is an incisive tool for disentangling excited state energies and dynamics in the condensed phase by directly mapping out the correlation between excitation and emission frequencies as a function of time. Despite its enhanced frequency resolution, the spectral window of detection is limited to the laser bandwidth, which has often hindered the visualization of full electronic energy relaxation pathways spread over the entire visible region. Here, we describe a high-sensitivity, ultrabroadband 2DES apparatus. We report a new combination of a simple and robust setup for increased spectral bandwidth and shot-to-shot detection. We utilize 8-fs supercontinuum pulses generated by gas filamentation spanning the entire visible region (450 - 800 nm), which allows for a simultaneous interrogation of electronic transitions over a 200-nm bandwidth, and an all-reflective interferometric delay system with angled nanopositioner stages achieves interferometric precision in coherence time control without introducing wavelength-dependent dispersion to the ultrabroadband spectrum. To address deterioration of detection sensitivity due to the inherent instability of ultrabroadband sources, we introduce a 5-kHz shot-to-shot, dual chopping acquisition scheme by combining a high-speed line-scan camera and two optical choppers to remove scatter contributions from the signal. Comparison of 2D spectra acquired by shot-to-shot detection and averaged detection shows a 15-fold improvement in the signal-to-noise ratio. This is the first direct quantification of detection sensitivity on a filamentation-based ultrabroadband 2DES apparatus." @default.
• W2739878895 created "2017-08-08" @default.
• W2739878895 creator A5027635932 @default.
• W2739878895 creator A5032132306 @default.
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• W2739878895 date "2017-07-27" @default.
• W2739878895 modified "2023-09-30" @default.
• W2739878895 title "Ultrabroadband 2D electronic spectroscopy with high-speed, shot-to-shot detection" @default.
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• W2739878895 doi "https://doi.org/10.1364/oe.25.018950" @default.
• W2739878895 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29041086" @default.
• W2739878895 hasPublicationYear "2017" @default.
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