Up-converted fluorescence from photosynthetic light-harvesting complexes linearly dependent on excitation intensity

Photosynthesis Research
Kristjan Leiger, A Freiberg

Abstract

Weak up-converted fluorescence related to bacteriochlorophyll a was recorded from various detergent-isolated and membrane-embedded light-harvesting pigment-protein complexes as well as from the functional membranes of photosynthetic purple bacteria under continuous-wave infrared laser excitation at 1064 nm, far outside the optically allowed singlet absorption bands of the chromophore. The fluorescence increases linearly with the excitation power, distinguishing it from the previously observed two-photon excited fluorescence upon femtosecond pulse excitation. Possible mechanisms of this excitation are discussed.

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Jul 19, 2013·The Journal of Physical Chemistry. B·Kristjan LeigerArvi Freiberg
Jun 5, 2014·The Journal of Physical Chemistry. B·Daniel A HartzlerSergei Savikhin

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Citations

Aug 23, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Kristjan LeigerArvi Freiberg

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