M. Orrit et al., SOME RECENT RESULTS IN SINGLE-MOLECULE SPECTROSCOPY, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 252, 1994, pp. 381-388
Fluorescence excitation spectra of small and dilute samples show the s
pectrally resolved lines of single solute molecules. The narrow lines
can be used as probes of the low-temperature motion of the matrix arou
nd the molecule, or as probes of intramolecular transitions between el
ectronic levels. In particular, electron spin resonance of a single mo
lecule can be observed.