tunnelling

https://doi.org/10.1351/goldbook.T06531
The process by which a particle or a set of particles crosses a barrier on its @P04780@ without having the energy required to surmount this barrier. Since the rate of tunnelling decreases with increasing @R05214@, it is significant in the context of isotope effects of hydrogen @I03331@.
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1174 [Terms] [Paper]
See also:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2282 [Terms] [Paper]
Citation: 'tunnelling' in IUPAC Compendium of Chemical Terminology, 3rd ed. International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. https://doi.org/10.1351/goldbook.T06531 RIS BibTex EndNote
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Last revised: February 24, 2014