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Optical absorption and electronic spectra of chlorophylls a and b

Hedayatifar, L ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1039/c6ra20226h
  3. Publisher: Royal Society of Chemistry , 2016
  4. Abstract:
  5. Photosynthesis includes capturing sunlight by an assembly of molecules, called chlorophylls, and directing the harvested energy in the form of electronic excitations to the reaction center. Here we report, using real-space density functional theory and time-dependent density functional theory together with GW calculations, the optical and electronic properties of the two main chlorophylls in green plants, namely, chlorophylls a and b. Furthermore, we estimate the dipole and primitive quadrupole electric moments of these molecules. We employ Casida's assignment ansatz to study the absorption spectra of the chlorophylls in the two main red and blue regions at various environments with different exchange-correlation functionals. In addition, we obtain the band gap of chlorophylls a and b, which are all in remarkable agreement with experimental observations
  6. Keywords:
  7. Chlorophyll ; Electromagnetic wave absorption ; Electronic properties ; Energy gap ; Light absorption ; Molecules ; Electric moments ; Electronic excitation ; Electronic spectrum ; Exchange-correlation functionals ; GW calculations ; Optical and electronic properties ; Reaction center ; Time dependent density functional theory ; Density functional theory
  8. Source: RSC Advances ; Volume 6, Issue 111 , 2016 , Pages 109778-109785 ; 20462069 (ISSN)
  9. URL: http://pubs.rsc.org/en/Content/ArticleLanding/2016/RA/C6RA20226H#!divAbstract