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The exact two-body reduction or leading finite-nuclear-mass treatment replacing electron mass by electron–nucleus reduced mass.
wp-physics-reduced_mass_approximationnist-hydrogennist-codataEach relation below ends at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
For a two-body atom the internal kinetic energy uses the exact reduced mass; for many-electron atoms related mass-polarization terms remain.
A more specific theory, model, entity class, or regime is obtained by restricting or extending the scope of a broader framework.
wp-physics-reduced_mass_approximationnist-hydrogenwp-physics-center_of_mass_separationnist-atomic-spectroscopyEach relation below starts at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
Replacing the electron mass by the reduced mass gives the leading finite-nuclear-mass correction to hydrogenic gross structure.
The target is recovered from the source either in a stated mathematical or asymptotic limit, or through a quantitatively controlled approximation with identified small parameters or omitted terms. The edge label and detail must state which case applies and its regime of validity.
wp-physics-reduced_mass_approximationnist-hydrogennist-codatawp-physics-rydberg_formula