Abstract
Dye molecules in organic matrices can have lifetime limited linewidths at liquid helium temperature. Single molecules in such systems are conventionally detected via fluorescence excitation spectroscopy. In this technique a very high signal to noise ratio can be obtained by exciting the molecule via its narrow zero phonon line and detecting its Stokes shifted emission. However, it eliminates the information on the coherent interaction of the molecule with the excitation beam.
© 2007 IEEE
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