Quantum Mechanical Tunneling in Chemical Physics

Hiroki Nakamura, Gennady Mil'nikov

April 12, 2013 by CRC Press
Reference - 226 Pages - 67 B/W Illustrations
ISBN 9781466507319 - CAT# K14664

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  • Offers a solid introduction of basic low-dimensional theories
  • Explains concepts and theories and gives numerical demonstrations of multidimensional effects
  • Provides accurate new methods developed by the authors to treat real chemical problems in multi-dimensional systems
  • Presents practical numerical applications for real polyatomic molecules such as hydroperoxy radicals, vinyl radicals, malonaldehyde, and formic acid dimers
  • Includes explanations of some peculiar phenomena that cannot be explained by one-dimensional theories
  • Describes a method to detect caustics in multi-dimensional space
  • Contains appendices with proofs and derivations of equations, and Fortran code to find tunneling paths in multi-dimensional space


Quantum mechanical tunneling plays important roles in a wide range of natural sciences, from nuclear and solid-state physics to proton transfer and chemical reactions in chemistry and biology. Responding to the need for further understanding of multidimensional tunneling, the authors have recently developed practical methods that can be applied to multidimensional systems. Quantum Mechanical Tunneling in Chemical Physics presents basic theories, as well as original ones developed by the authors. It also provides methodologies and numerical applications to real molecular systems.

The book offers information so readers can understand the basic concepts and dynamics of multidimensional tunneling phenomena and use the described methods for various molecular spectroscopy and chemical dynamics problems. The text focuses on three tunneling phenomena: (1) energy splitting, or tunneling splitting, in symmetric double well potential, (2) decay of metastable state through tunneling, and (3) tunneling effects in chemical reactions. Incorporating mathematics to explain basic theories, the text requires readers to have graduate-level math to grasp the concepts presented.

The book reviews low-dimensional theories and clarifies their insufficiency conceptually and numerically. It also examines the phenomenon of nonadiabatic tunneling, which is common in molecular systems. The book describes applications to real polyatomic molecules, such as vinyl radicals and malonaldehyde, demonstrating the high efficiency and accuracy of the method. It discusses tunneling in chemical reactions, including theories for direct evaluation of reaction rate constants for both electronically adiabatic and nonadiabatic chemical reactions. In the final chapter, the authors touch on future perspectives.