Figure 5.

(a) Energy level scheme for model dimer system formed between two different chromophores A and B with different transition energies. (b) Corresponding linear absorption spectrum for model dimer. (c) Two-dimensional spectrum of dimer system at 0 waiting time between the pump and probe pulses. The inhomogeneous and homogeneous linewidths are indicated by the diagonal and antidiagonal linewidths, respectively. Cross peaks appear because the states share a common ground state. (Online version in colour.)