TY - JOUR AU - Cho, B AU - Carlsson, C AU - Martinez, Ricardo Jimenez C2 - Journal of Chemical Physics DA - 2006-01-01 00:01:00 LA - en M1 - 124 PB - Journal of Chemical Physics PY - 2006 TI - Photon echo spectroscopy of porphyrins and heme proteins: effects of quasidegenerate electronic structure on the peak shift decay ER -