Ultrafast dynamics of a bi-stable azopyridine Ni-porphyrin spin switch after photoexcitation in the porphyrin B-bandsSebastian Megow, Julia Bahrenburg, Mark Dittner, Birthe Kohly, Joachim Gripp, Marcel Dommaschk, Christian Schütt, Rainer Herges and Friedrich TempsEPJ Web Conf., 205 (2019) 05019DOI: https://doi.org/10.1051/epjconf/201920505019