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In atomic physics, Rydberg correction refers to a subject put into a formula for the energy of a single electron. The energy of Rydberg states can be refined by including a correction called the quantum defect in the Rydberg formula. The "quantum defect" correction is associated with the presence of a distributed ionic core. Even for many electronically excited molecular systems, the ionic core interaction with an excited electron can take on the general aspects of the interaction between the proton and the electron in the hydrogen atom. The spectroscopic assignment of these states follows the Rydberg formula and they are called Rydberg states of molecules. The F terms of the formula are extremely small, while the S terms are very large.
- Herzberg, Gerhard; Spinks, John William Tranter (1944). Atomic Spectra and Atomic Structure: By Gerhard Herzberg. Courier Dover Publications. p. 58. ISBN 978-0-486-60115-1. Retrieved 13 December 2012.