頁籤選單縮合
題 名 | Exciton States and Relaxation in Molecular Aggregates: Numerical Study of Photosynthetic Light Harvesting |
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作 者 | Pullerits,Tonu; | 書刊名 | Journal of the Chinese Chemical Society |
卷 期 | 47:4A 民89.08 |
頁 次 | 頁773-784 |
分類號 | 373.141 |
關鍵詞 | Excitons; Photosynthesis; LH2; Coherence; |
語 文 | 英文(English) |
英文摘要 | In this article we briefly review the molecular exciton theory and apply it to photosynthetic light harvesting systems. We derive expressions for exciton relaxation rattes using perturbation theory in Hilbert space representation and show how the Forster equation can be obtained from a general relaxation rate expression in case of well localized excitons. A detailed analysis of the exciton level structure and wavefunctions of the ring structure is presented for diagonal and nondiagonal disorder. We conclude that the latter plays only a minor role in light-harvesting systems. We emphasize the relaxation rate dependency on square of the energy gap, which makes the high frequency modes particularly important for the exciton relaxation. We found a reasonably good agreement between the measured and calculated relaxation rates in photosynthetic purple bacteria. |
本系統中英文摘要資訊取自各篇刊載內容。