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Phys. Rev. Lett. 29, 705 - 708 (1972)

Thermodynamic Fluctuations in a Reacting System—Measurement by Fluorescence Correlation Spectroscopy

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Douglas Magde *, Elliot Elson †, and W. W. Webb ‡
Cornell University, Ithaca, New York 14850

Received 10 July 1972

The temporal correlations of thermodynamic concentration fluctuations have been measured in a chemically reactive system at equilibrium by observing fluctuations of the fluorescence of a reaction product. The experiment yields the chemical rate constants and diffusion coefficients and shows the coupling among them. Data are reported for binding of ethidium bromide to DNA.


©1972 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.29.705
DOI: 10.1103/PhysRevLett.29.705

* Now at Department of Chemistry, Washington State University, Pullman, Wash. 99163.
† Department of Chemistry.
‡ School of Applied and Engineering Physics and Laboratory for Atomic and Solid State Physics.

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