Population and structural changes of the metastable state II in sodiumnitroprusside (Na2[Fe(CN)5NO]*2 H2O) at 60 K

We present population dynamics and structural properties of the metastable electronic excited state MS II in sodiumnitroprusside Na 2 [Fe(CN) 5 NO]. 2 D 2 O. The population of MS II was performed in a two step process: First by irradiation with light of λ = 476.5 nm in order to excite MS I by about 50% and secondly by irradiation with light of λ = 1064 nm to transfer 30% of the anions from MS I to MS II . The population is determined by Mossbauer spectroscopy in dependence on light exposure. Structure analysis of a single crystal with 32% of the anions in MS II, 8% in MS I and 60% in the ground state has been done using neutron single crystal diffraction.