Silver atoms fluorescent states

Techniques other than UV-visible spectroscopy have been used in matrix-isolation studies of Ag see, for example, some early ESR studies by Kasai and McLeod 56). The fluorescence spectra of Ag atoms isolated in noble-gas matrices have been recorded (76,147), and found to show large Stokes shifts when optically excited via a Si j — atomic transition which is threefold split in the matrix by spin-orbit and vibronic interactions. The large Stokes shifts may be explained in terms of an excited state silver atom-matrix cage complex in this... 

Its fluorescence emission is totally quenched (0jpmicellar solutions of II. Instead, under visible light illumination one observes a rapid bleaching of the cyanine and formation of a new stable absorption band with a maximum at X = Ul5 nm. The spectrum can be attributed to silver atoms stabilized by the macrocyclic ligand. It appears that through insertion in the crown ether cavity Ag is prevented from aggregation and hence preserved in the monoatomic state. 

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