Dynamics of Electron Transport in Macromolecules

Potasek, M J

doi:10.1016/b978-0-12-167860-9.50035-5

Cited by 1 publication

(2 citation statements)

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“…By this means Potasek & Hopfield (1977 a, b) and Potasek (1979) carried out the measurements on two systems, namely cytochrome c-iron hexacyanide and cytochrome c peroxidase-cytochrome c. For the cytochrome c peroxidase-cytochrome c system they measure a chargetransfer band at 1-2-1-5 eV (1o-o-8/im), full width at half-maximum height, assuming a Gaussian shape, and a return electron transfer rate of 1-7 x io 4 sec~1. The observed modulation of the measuring light was of the order of 3 x io~7.…”

Section: (C) Charge-transfer Bandsmentioning

confidence: 95%

“…The intensity of a charge-transfer band is proportional to the square of the Hamiltonian matrix element for the electron transfer and so is expected to be very weak for highly non-adiabatic electron transfers such as many of those encountered in biological systems. Hopfield (1979) and Potasek (1979) undertook to detect and measure such. Starting with the donor-acceptor complexes in their ground state (electron in acceptor) illumination with light of wavelength corresponding to the charge-transfer band should raise some of the complexes to their excited state in which the electron is back on the donor.…”

Section: (C) Charge-transfer Bandsmentioning

confidence: 99%

See 1 more Smart Citation

Quantum mechanical tunnelling in biological systems

DeVault

1980

Quart. Rev. Biophys.

329

187

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‘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.

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Section: (C) Charge-transfer Bandsmentioning

confidence: 95%

Section: (C) Charge-transfer Bandsmentioning

confidence: 99%