Hydrogen bond strengthening of cis-trans glyoxal dimers in electronic excited states: A theoretical study

Small part of the calculated vibrational absorption spectra of selected t2t2 (one of Glyoxal dimers) in different electronic states. The blue color represents the vibrational spectrum on the ground state and the red one is related to the S1 excited state. The spectra have been calculated with the MP2 (S0) and CC2 (S1) methods.