Abstract
The intramolecular binding of carbon monoxide (/ and / mixtures) to myoglobin at 20 and 60 K is observed with time-resolved Fourier-transform infrared spectroscopy. The binding rates (at ≈ 1 ks) for the molecules , , and are in the ratio 1:0.84:0.65 at 20 K, 1:0.87:0.84 at 60 K. The large isotope effect confirms earlier evidence for molecular tunneling. The fact that binds faster than implies that structure effects are significant in molecular tunneling.
- Received 3 March 1980
DOI:https://doi.org/10.1103/PhysRevLett.44.1157
©1980 American Physical Society