Inelastic neutron scattering study of light-induced dynamics of a photosynthetic membrane system

Journal Article · Fri Jan 15 00:00:00 EST 2010 · Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print)

DOI:https://doi.org/10.1103/PHYSREVE.81.011901· OSTI ID:21344697

Furrer, A; Stoeckli, A ^[1]

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1. Laboratory for Neutron Scattering, ETH Zuerich and PSI Villigen, CH-5232 Villigen PSI (Switzerland)

Inelastic neutron scattering was employed to study photoeffects on the molecular dynamics of membranes of the photosynthetic bacterium Rhodopseudomonas viridis. The main photoactive parts of this biomolecular system are the chlorophyll molecules whose dynamics were found to be affected under illumination by visible light in a twofold manner. First, vibrational modes are excited at energies of 12(2) and 88(21) cm{sup -1}. Second, a partial 'freezing' of rotational modes is observed at energies of 1.2(3) and 2.9(5) cm{sup -1}. These results are attributed to a possible coupling between molecular motions and particular mechanisms in the photosynthetic process.

• OSTI ID: 21344697
• Journal Information: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print), Vol. 81, Issue 1; Other Information: DOI: 10.1103/PhysRevE.81.011901; (c) 2010 The American Physical Society; ISSN 1539-3755
• Country of Publication: United States
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
CHLOROPHYLL
INELASTIC SCATTERING
MOLECULAR DYNAMICS METHOD
NEUTRON DIFFRACTION
PHOTOSYNTHETIC MEMBRANES
RHODOPSEUDOMONAS
BACTERIA
CALCULATION METHODS
CARBOXYLIC ACIDS
COHERENT SCATTERING
DIFFRACTION
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
MEMBRANES
MICROORGANISMS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOSYNTHETIC BACTERIA
PHYTOCHROMES
PIGMENTS
PORPHYRINS
PROTEINS
SCATTERING