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A contact-like correction in the low-energy expansion of the Dirac equation, affecting primarily states with nonzero density at the nucleus.
wp-physics-darwin_termnist-hydrogenEach relation below ends at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
The Darwin contact term appears at order in the low-energy Foldy–Wouthuysen expansion of Dirac dynamics in an electric field.
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-darwin_termnist-hydrogenEach relation below starts at this concept.
No direct relations are authored in this direction.