Abstract

In an optical-radio-frequency double-resonance experiment on NO 2 a broad resonance structure appears superimposed on the normal magnetic resonance spectrum. We show here that the broad resonance structure is associated with the preparation of the free molecule into an initial state and the subsequent, fast (relative to photon emission) evolution into another (long-lived) state from which it decays radiatively. The results confront us with an interesting problem concerning the time evolution of a quantum mechanical system.

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