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Cited by 30Photosynthetic Processes and MechanismsPhotochemistry and Electron Transfer StudiesSpectroscopy and Quantum Chemical Studies

LASER PULSE EXCITATION STUDIES OF THE FLUORESCENCE OF CHLOROPLASTS

Swenberg, C. E., Geacintov, N. E., Breton, J.·1978·Photochemistry and Photobiology
DOI 10.1111/j.1751-1097.1978.tb07738.x
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Abstract

Abstract. The fluorescence yield, φ, as a function of single picosecond laser pulse intensity was experimentally studied in spinach chloroplasts and for chlorophyll a in ethyl ether solution. The progressive decrease in φ with increasing incident intensity for in vivo chlorophyll was found to be adequately explained within the context of continuum bimolecular kinetics with a singlet‐singlet fusion rate constant of γ=5×‐9 cm‐3 s‐1 at room temperature. We discuss qualitatively how the fluorescence quantum yield depends on the duration and intensity of the incident pulse. The identity of φ vs l (the number of absorbed quanta) curves at the emission maxima of 685 nm and 735 nm for single picosecond pulse mode of excitation is explained within the context of Butler's tripartite model of the fluorescence of chloroplasts at 77 K. Various models relating γ to the singlet exciton diffusion coefficient and the Förster energy transfer rate are used to infer lower bounds to these physical parameters. Predictions and supporting experimental evidence for the tripartite model are discussed.

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Crossref · 10.1111/j.1751-1097.1978.tb07738.x

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43 of 43 references verified0 citation errors · 0 not checkable

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  • The 2D tryptophan photoexcitation diffusion length of 6.64 nm is surprisingly high in microtubules given their structural roles and the chlorophyll a equivalent value of 20-80 nm.

    “The two-dimensional tryptophan photoexcitation diffusion length of 6.64 nm is surprisingly high in microtubules, given that they are optimized to play structural roles in the cell and that the equivalent value for chlorophyll a, which is optimized for electronic energy transfer, is only 20–80 nm.”

    From Electronic energy migration in microtubules (2023) · cites this paper as [59]

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Authors
Swenberg, C. E., Geacintov, N. E., & Breton, J.
Affiliations
  • St. Elizabeths Hospital (US)
  • New York University (US)
ORCID
Geacintov, N. E.
Venue
Photochemistry and Photobiology
Publisher
Wiley
Published
1978-12
Volume
28
Issue
6
Pages
999-1006
ISSN
  • 0031-8655 (ISSN-L)
  • 1751-1097
DOI
10.1111/j.1751-1097.1978.tb07738.x
OpenAlex
W2029102176
Cited by
30
References
43
Citations by year
2025: 4 · 2023: 1 · 2022: 1 · 2016: 1 · 2013: 1
FWCI
1.88
Type
journal article
Language
en
Open access
closed
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor, 10624 d)
Locations
Photochemistry and Photobiology (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Spectroscopy and Quantum Chemical Studies
Keywords
chloroplast fluorescence, chlorophyll a, picosecond laser excitation, fluorescence quantum yield, bimolecular kinetics, fluorescence resonance energy transfer, spinach chloroplasts, low-temperature fluorescence

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