Possible influence of a low-lying "covalent" excited state on the absorption spectrum and photoisomerization of 11-cis retinal

Robert R. Birge, Klaus Schulten, Martin Karplus

Research output: Contribution to journalArticlepeer-review

Abstract

The anomalous temperature dependence of the absorption spectrum and photochemical isomerization efficiency of 11-cis retinal is analyzed in terms of an equilibrium mixture of distorted 12-s-cis and distorted 12-s-trans conformers with the latter increasingly populated at lower temperature and/or greater solvent polarity. Inclusion of all possible singly and doubly excited configurations in the PFP formalism predicts a conformationally variant level ordering in that all 12-s-cis conformations have a lowest excited "1Bu"-like singlet state whereas the majority of the 12-s-trans conformations have a lowest excited "1Ag"-like singlet state.

Original languageEnglish (US)
Pages (from-to)451-454
Number of pages4
JournalChemical Physics Letters
Volume31
Issue number3
DOIs
StatePublished - Mar 15 1975

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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