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Excitation energy transfer and charge separation in the isolated Photosystem II reaction center (1996)

Greenfield, Scott R. ; Wasielewski, Michael R.

Springer

Photosynthesis research 48 (1996), S. 83-97

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ISSN: 1573-5079

Keywords: electron transfer ; pheophytin ; primary photochemistry ; P680 ; ultrafast spectroscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract The nature of excitation energy transfer and charge separation in isolated Photosystem II reaction centers is an area of considerable interest and controversy. Excitation energy transfer from accessory chlorophyll a to the primary electron donor P680 takes place in tens of picoseconds, although there is some evidence that thermal equilibration of the excitation between P680 and a subset of the accessory chlorophyll a occurs on a 100-fs timescale. The intrinsic rate for charge separation at low temperature is accepted to be ca. (2 ps)−1, and is based on several measurements using different experimental techniques. This rate is in good agreement with estimates based on larger sized particles, and is similar to the rate observed with bacterial reaction centers. However, near room temperature there is considerable disagreement as to the observed rate for charge separation, with several experiments pointing to a ca. (3 ps)−1 rate, and others to a ca. (20 ps)-1 rate. These processes and the experiments used to measure them will be reviewed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00040999

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Photorefractive liquid crystalsWe gratefully acknowledge support from the Office of Computational and Technological Programs, Division of Advanced Energy Projects, U. S. Department of Energy, under contract W-31-109-ENG-38. (1996)

Wiederrecht, Gary P. ; Yoon, Beth A. ; Wasielewski, Michael R.

Weinheim : Wiley-Blackwell

Advanced Materials 8 (1996), S. 535-539

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ISSN: 0935-9648

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Photorefractive liquid crystals represent the newest class of photorefractive materials. The low electric fields required for reorienting liquid crystals, combined with their high birefringence, results in the observation of photorefractivity with very low optical intensities and low applied fields. Photoinducing efficient charge transport over macroscopic distances is the primary hurdle for producing the space-charge field required for photorefractivity.

Additional Material: 3 Ill.