Fano profiles on multiphonon continua in electronic transitions of matrix-isolated NO

Fano line shapes are reported in the excitation spectrum of the total fluorescence of NO trapped in Kr matrices. They result from the homogeneous configuration mixing of the sharp valence vibrational bands B²II(v'=12,15,18)-X²{Π}(v''=0) with the broadened multiphonon Rydberg vibrational bands C²{Π}(v'=0,1,2)-X²{Π}(v''=0). The main features of the spectrum are reproduced by a simulation.