heavy atom isotope effect

https://doi.org/10.1351/goldbook.H02757
An isotope effect due to isotopes other than those of hydrogen.
Source:
PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1130 (https://doi.org/10.1351/pac199466051077)