Quantitative investigations of quantum coherence for a light-harvesting protein at conditions simulating photosynthesis

Daniel Turner, Rayomond Dinshaw, Kyung Koo Lee, Michael S. Belsley, Krystyna E. Wilk, Paul M G Curmi, Gregory D. Scholes

Research output: Contribution to journalArticle

Abstract

Recent measurements using two-dimensional electronic spectroscopy (2D ES) have shown that the initial dynamic response of photosynthetic proteins can involve quantum coherence. We show how electronic coherence can be differentiated from vibrational coherence in 2D ES. On that basis we conclude that both electronic and vibrational coherences are observed in the phycobiliprotein light-harvesting complex PC645 from Chroomonas sp. CCMP270 at ambient temperature. These light-harvesting antenna proteins of the cryptophyte algae are suspended in the lumen, where the pH drops significantly under sustained illumination by sunlight. Here we measured 2D ES of PC645 at increasing levels of acidity to determine if the change in pH affects the quantum coherence; quantitative analysis reveals that the dynamics are insensitive to the pH change.

Original languageEnglish (US)
Pages (from-to)4857-4874
Number of pages18
JournalPhysical Chemistry Chemical Physics
Volume14
Issue number14
DOIs
StatePublished - Apr 14 2012

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photosynthesis
Photosynthesis
proteins
Proteins
Phycobiliproteins
electronics
lumens
algae
sunlight
Algae
dynamic response
Acidity
acidity
quantitative analysis
ambient temperature
Dynamic response
antennas
Lighting
illumination
Spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Physics and Astronomy(all)

Cite this

Quantitative investigations of quantum coherence for a light-harvesting protein at conditions simulating photosynthesis. / Turner, Daniel; Dinshaw, Rayomond; Lee, Kyung Koo; Belsley, Michael S.; Wilk, Krystyna E.; Curmi, Paul M G; Scholes, Gregory D.

In: Physical Chemistry Chemical Physics, Vol. 14, No. 14, 14.04.2012, p. 4857-4874.

Research output: Contribution to journalArticle

Turner, Daniel ; Dinshaw, Rayomond ; Lee, Kyung Koo ; Belsley, Michael S. ; Wilk, Krystyna E. ; Curmi, Paul M G ; Scholes, Gregory D. / Quantitative investigations of quantum coherence for a light-harvesting protein at conditions simulating photosynthesis. In: Physical Chemistry Chemical Physics. 2012 ; Vol. 14, No. 14. pp. 4857-4874.
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