 Urey–Bigeleisen–Mayer equation

The Urey–Bigeleisen–Mayer equation is a formula used in physical chemistry and isotopic chemistry to relate the equilibrium constants of chemical reactions involving isotopes to the differences in their vibrational energies. It provides a way to understand and quantify the isotopic effects that occur in chemical reactions, particularly the fractionation of isotopes. This equation is particularly useful in studying the behavior of molecules containing different isotopes of elements, such as hydrogen, carbon, nitrogen, and oxygen.