Ultrafast Exciton Relaxation in the B850 Antenna Complex of Rhodobacter sphaeroides
Spectral changes were measured with femtosecond resolution following low-intensity, broad-band excitation of the peripheral antenna complex of the purple photosynthetic bacterium Rhodobacter sphaeroides. Absorption anisotropy decays also were measured. We identified a 35-fs relaxation of the absorpt...
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| Veröffentlicht in: | Proceedings of the National Academy of Sciences - PNAS 1996-11, Vol.93 (24), p.13774-13779 |
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| container_title | Proceedings of the National Academy of Sciences - PNAS |
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| creator | Nagarajan, V. Alden, R. G. Williams, J. C. Parson, W. W. |
| description | Spectral changes were measured with femtosecond resolution following low-intensity, broad-band excitation of the peripheral antenna complex of the purple photosynthetic bacterium Rhodobacter sphaeroides. Absorption anisotropy decays also were measured. We identified a 35-fs relaxation of the absorption and emission spectra of the excited state, as well as a 20-fs anisotropy decay. We interpret these results as interlevel relaxation and dephasing, respectively, of extensively delocalized exciton states of the circular bacteriochlorophyll aggregate. |
| doi_str_mv | 10.1073/pnas.93.24.13774 |
| format | Article |
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G.</creatorcontrib><creatorcontrib>Williams, J. C.</creatorcontrib><creatorcontrib>Parson, W. W.</creatorcontrib><title>Ultrafast Exciton Relaxation in the B850 Antenna Complex of Rhodobacter sphaeroides</title><title>Proceedings of the National Academy of Sciences - PNAS</title><addtitle>Proc Natl Acad Sci U S A</addtitle><description>Spectral changes were measured with femtosecond resolution following low-intensity, broad-band excitation of the peripheral antenna complex of the purple photosynthetic bacterium Rhodobacter sphaeroides. Absorption anisotropy decays also were measured. We identified a 35-fs relaxation of the absorption and emission spectra of the excited state, as well as a 20-fs anisotropy decay. We interpret these results as interlevel relaxation and dephasing, respectively, of extensively delocalized exciton states of the circular bacteriochlorophyll aggregate.</description><subject>Absorption spectra</subject><subject>Anisotropy</subject><subject>Antennas</subject><subject>Bacteria</subject><subject>Bacterial Chromatophores - physiology</subject><subject>Biochemistry</subject><subject>Biological Sciences</subject><subject>Excitons</subject><subject>Genes, Bacterial</subject><subject>Kinetics</subject><subject>Laser beams</subject><subject>Lasers</subject><subject>Light-Harvesting Protein Complexes</subject><subject>Molecular biology</subject><subject>Molecules</subject><subject>Photosynthetic Reaction Center Complex Proteins - biosynthesis</subject><subject>Photosynthetic Reaction Center Complex Proteins - chemistry</subject><subject>Pumps</subject><subject>Rhodobacter sphaeroides</subject><subject>Rhodobacter sphaeroides - genetics</subject><subject>Rhodobacter sphaeroides - metabolism</subject><subject>Sequence Deletion</subject><subject>Spectrophotometry, Infrared</subject><subject>Thermodynamics</subject><subject>Time constants</subject><subject>Time Factors</subject><subject>Wavelengths</subject><issn>0027-8424</issn><issn>1091-6490</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1996</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp9kcFrFDEUxoModVu9iyAOPUgvs743SXYS8NIutQoFodpzyMwk7iyzyZhkyvrfm3XXpXrw9B58v-_xPT5CXiHMEWr6fnQ6ziWdV2yOtK7ZEzJDkFgumISnZAZQ1aVgFXtOTmNcA4DkAk7IiZCMAuKMfL0fUtBWx1Rcb9s-eVfcmUFvderz2rsirUxxJTgUly4Z53Sx9JtxMNvC2-Ju5Tvf6DaZUMRxpU3wfWfiC_LM6iGal4d5Ru4_Xn9bfipvv9x8Xl7eli0TmEotdYesbq3AxlKJlDMtO2YRQdhOLgQ0sja0wdY2aDjruBWCc2Ett6C5pWfkw_7uODUb07XG5VcGNYZ-o8NP5XWv_lZcv1Lf_YNCyaoq298d7MH_mExMatPH1gyDdsZPUSGvF8BQZvD8H3Dtp-Dya6oCpAues2YI9lAbfIzB2GMOBLXrSu26UpKqiqnfXWXLm8f5j4ZDOVm_OOg75x_10QVlp2FIZpsy-vb_aCZe74l1TD4cEQayrukvIymyTQ</recordid><startdate>19961126</startdate><enddate>19961126</enddate><creator>Nagarajan, V.</creator><creator>Alden, R. 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G. ; Williams, J. C. ; Parson, W. 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G.</au><au>Williams, J. C.</au><au>Parson, W. W.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Ultrafast Exciton Relaxation in the B850 Antenna Complex of Rhodobacter sphaeroides</atitle><jtitle>Proceedings of the National Academy of Sciences - PNAS</jtitle><addtitle>Proc Natl Acad Sci U S A</addtitle><date>1996-11-26</date><risdate>1996</risdate><volume>93</volume><issue>24</issue><spage>13774</spage><epage>13779</epage><pages>13774-13779</pages><issn>0027-8424</issn><eissn>1091-6490</eissn><abstract>Spectral changes were measured with femtosecond resolution following low-intensity, broad-band excitation of the peripheral antenna complex of the purple photosynthetic bacterium Rhodobacter sphaeroides. Absorption anisotropy decays also were measured. We identified a 35-fs relaxation of the absorption and emission spectra of the excited state, as well as a 20-fs anisotropy decay. 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| issn | 0027-8424 1091-6490 |
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| source | MEDLINE; PubMed Central; Alma/SFX Local Collection; Free Full-Text Journals in Chemistry; JSTOR |
| subjects | Absorption spectra Anisotropy Antennas Bacteria Bacterial Chromatophores - physiology Biochemistry Biological Sciences Excitons Genes, Bacterial Kinetics Laser beams Lasers Light-Harvesting Protein Complexes Molecular biology Molecules Photosynthetic Reaction Center Complex Proteins - biosynthesis Photosynthetic Reaction Center Complex Proteins - chemistry Pumps Rhodobacter sphaeroides Rhodobacter sphaeroides - genetics Rhodobacter sphaeroides - metabolism Sequence Deletion Spectrophotometry, Infrared Thermodynamics Time constants Time Factors Wavelengths |
| title | Ultrafast Exciton Relaxation in the B850 Antenna Complex of Rhodobacter sphaeroides |
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