Photon echo spectroscopy of porphyrins and heme proteins: effects of quasidegenerate electronic structure on the peak shift decay.
Cho BM, Carlsson CF, Jimenez R. Photon echo spectroscopy of porphyrins and heme proteins: effects of quasidegenerate electronic structure on the peak shift decay. J Chem Phys. 2006 Apr 14; 124(14):144905.