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Quantum mechanical tunnelling in biological systems

Published online by Cambridge University Press:  17 March 2009

Don Devault
Don Devault
Affiliation:
Department of Physiology and Biophysics, University of Illinois, Urbana, Illinois 61801, U.S.A.
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Extract

‘Tunnelling’ is the metaphorical name given to the process, possible in quantum mechanics, but not in classical mechanics, whereby a particle can disappear from one side of a potential-energy barrier and appear on the other side without having enough kinetic energy to mount the barrier. One can think of this as a manifestation of the wave-nature of particles. The wavelength is larger if a particle is lighter. In particular electrons, being very light compared to atoms, have wavelengths as large or larger than atoms at energies found in the valence shells of molecules. Thus, they easily ooze through and around atoms and molecules. We are also concerned with the tunnelling of heavy particles: nuclei, atoms, molecules.

Type
Research Article
Information
Quarterly Reviews of Biophysics , Volume 13 , Issue 4 , November 1980 , pp. 387 - 564
Copyright
Copyright © Cambridge University Press 1980

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