Isotope Effect in Molecular Tunneling

J. O. Alben, D. Beece, S. F. Bowne, L. Eisenstein, H. Frauenfelder, D. Good, M. C. Marden, P. P. Moh, L. Reinisch, A. H. Reynolds, and K. T. Yue
Phys. Rev. Lett. 44, 1157 – Published 28 April 1980
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Abstract

The intramolecular binding of carbon monoxide (C13O16/C12O16 and C12O18/C12O16 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 C12O16, C12O18, and C13O16 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 C12O18 binds faster than C13O16 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

Authors & Affiliations

J. O. Alben, D. Beece, S. F. Bowne, L. Eisenstein, H. Frauenfelder, D. Good, M. C. Marden, P. P. Moh, L. Reinisch, A. H. Reynolds*, and K. T. Yue

  • Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, and Department of Physiological Chemistry, Ohio State University, Columbus, Ohio 43210

  • *Present address: Bell Telephone Laboratories, Inc., Murray Hill, N. J. 07974.

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Vol. 44, Iss. 17 — 28 April 1980

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