Quantifying charge resonance and multiexciton character in coupled chromophores by charge and spin cumulant analysis
We extend excited-state structural analysis to quantify the charge-resonance and multi-exciton character in wave functions of weakly interacting chromophores such as molecular dimers. The approach employs charge and spin cumulants which describe inter-fragment electronic correlations in molecular complexes. We introduce indexes corresponding to the weights of local, charge resonance, and biexciton (with different spin structure) configurations that can be computed for general wave functions thus allowing one to quantify the character of doubly excited states. The utility of the approach is illustrated by applications to several small dimers, e.g., He-H2, (H2)2, and (C2H4)2, using full and restricted configuration interaction schemes. In addition, we present calculations for several systems relevant to singlet fission, such as tetracene, 1,6-diphenyl-1,3,5-hexatriene, and 1,3- diphenylisobenzofurandimers. Related Research |
Funding is provided by:
 National Science Foundation |  U.S. Department of Energy |  U.S. Army Research Laboratory |  USC Dornsife College of Letters, Arts, and Sciences |
Contact info
SSC-409, University of Southern California
Los Angeles, CA 90089-0482
Phone: 213-740-4929 (Prof. Krylov), 213-740-0893 (Lab)
Webmaster:
Beautiful shell pictures by The Space Shell Art Gallery