Journal
OPTICS EXPRESS
Volume 26, Issue 17, Pages 22327-22341Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.022327
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Funding
- Air Force Office of Scientific Research (AFOSR) [FA9550-15-1-0210]
- Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of the U.S. Department of Energy [DE-FG02-05ER15661]
- National Science Foundation (NSF) [CHE-1301109]
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Fluorescence-detected two-dimensional electronic spectroscopy (F-2DES) projects the third-order non-linear polarization in a system as an excited electronic state population which is incoherently detected as fluorescence. Multiple variants of F-2DES have been developed. Here, we report phase-modulated F-2DES measurements on a strongly coupled symmetric bacteriochlorin dyad. a relevant 'toy' model for photosynthetic energy and charge transfer. Coherence map analysis shows that the strongest frequency observed in the dyad is well-separated from the excited state electronic energy gap, and is consistent with a vibrational frequency readily observed in bacteriochlorin monomers. Kinetic rate maps show a picosecond relaxation timescale between the excited states of the dyad. To our knowledge this is the first demonstration of coherence and kinetic analysis using the phase-modulation approach to F-2DES. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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