Tunneling in Ligand Binding to Heme Proteins
- 4 June 1976
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 192 (4243) , 1002-1004
- https://doi.org/10.1126/science.1273579
Abstract
Rebinding of carbon monoxide to the beta chain of hemoglobin after photodissociation by a laser flash is intramolecular below about 200 K. Above 25 K, rebinding occurs via classical over-the-barrier motion; below, quantum-mechanical tunneling dominates. Both are described by an energy spectrum peaked at Epeak=4.0 kilojoules per mole. The barrier width d(E), determined from the energy dependence of the tunneling rate, depends on barrier height, d(E) approximately 0.05 nanometer X (E/Epeak) 1.5.This publication has 18 references indexed in Scilit:
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