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Detection and spectroscopy of single pentacene molecules in a p-terphenyl crystal by means of fluorescence excitation (1991)

Ambrose, W. P. ; Basché, Th. ; Moerner, W. E.

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 95 (1991), S. 7150-7163

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ISSN: 1089-7690

Source: AIP Digital Archive

Topics: Physics , Chemistry and Pharmacology

Notes: Recent advances in fluorescence excitation spectroscopy with high efficiency have produced greatly improved optical spectra for the first electronic transition of individual single molecules of pentacene in p-terphenyl crystals at low temperatures (1.5 to 10 K). Two classes of single molecule behavior are observed: class I molecules have time-independent resonance frequencies, and class II molecules show a diffusive motion among several resonant frequencies with time which we term "spectral diffusion'' by analogy with a similar effect which is common in amorphous materials. The temperature dependence of the linewidth and the power dependence of the fluorescence emission rate and of the linewidth are reported and analyzed. Various forms of the surprising class II behavior are described, including jumping among several discrete frequencies, creeping toward the center of the inhomogeneous line in many small steps, and a wandering among many possible resonance frequencies. The occurrence of class II behavior is restricted to the wings of the inhomogeneous line suggesting that the effect is correlated with some form of local disorder. The spectral diffusion rate increases with increasing temperature, suggesting that the effect may be due to phonon-assisted transitions of local degrees of freedom around the pentacene defect whose source remains to be identified conclusively.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.461392

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Fluorescence spectroscopy and spectral diffusion of single impurity molecules in a crystal (1991)

Ambrose, W. P. ; Moerner, W. E.

[s.l.] : Nature Publishing Group

Nature 349 (1991), S. 225-227

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] In our fluorescence excitation technique, a tunable dye laser (1 MHz linewidth) was used to excite the 0-0 electronic transition of pentacene substitutional impurities in the /?-terphenyl crystal. As the excitation wavelength was varied, the emitted fluorescence that passed through a ...