FCE Program to compute optical spectra with the Full Cumulant Expansion

This FORTRAN 90 program implements the Full Cumulant Expansion method for the calculation of absorption and circular dichroism spectra of multichromophoric systems. The program refers to the implementation in Cupellini, Lipparini, and Cao, "Absorption and Circular Dichroism Spectra of Molecular Aggregates with the Full Cumulant Expansion.", J. Phys. Chem. B 2020, 124, 39, 8610–8617, https://pubs.acs.org/doi/10.1021/acs.jpcb.0c05180 The theory of FCE is described in Ma and Cao, J. Chem. Phys. 2015, 142, 09410