Circular Dichroism of a Finite Number of Identical Chromophores in a Helical Arrangement

Authors

  • Prof. Dr. Bernhard Dick

    Corresponding author
    1. Institut für Physikalische und Theoretische Chemie, Universität Regensburg, D 93040 Regensburg (Germany), Fax: (+49) 941 943 4488
    • Institut für Physikalische und Theoretische Chemie, Universität Regensburg, D 93040 Regensburg (Germany), Fax: (+49) 941 943 4488
    Search for more papers by this author

Abstract

Compact expressions to calculate the transition energies, absorption line strengths, and rotational line strengths of circular dichroism for the excitonic states in a helical arrangement of N identical chromophores are presented. The absorption spectrum A(ν) and the CD spectrum C(ν) are given in terms of the same function G(ν,α) as equation image, equation image. The function G(ν,α) depends only on the helical angle α and the number N of interacting chromophores. An analytical expression can be given when only next-neighbor interactions are considered. All other structural parameters of the system (e.g. orientation of transition dipoles and the translation vector of the helix) enter only into the prefactors aj and sj.

Ancillary