Lamb shiftn.

Brit.

/ˈlam ʃɪft/, U.S.

/ˈlæm ˌʃɪft/

Etymology: < the name of Willis E. Lamb (1913–2008), U.S. physicist (who with R. C. Retherford demonstrated the effect in 1947) + shift n.

Physics.

A displacement of energy levels in hydrogen and hydrogen-like atoms such that those with the same values of the quantum numbers n and j but different values of l are not coincident, as predicted by Dirac's theory, but separated by a very small amount (the level with the lower value of l being the higher).

ΚΠ

1948 Physical Rev. 74 1157 The effects treated are the Lamb shift, the correction of the g-factor..and the correction of the Compton scattering cross section.

1950 Physical Rev. 77 745 (heading) Departure of the Lamb shift from the h⁻³ law in He⁺.

1958 E. U. Condon & H. Odishaw Handbk. Physics vii. iv. 63/1 The Lamb shift has been interpreted..as resulting from changes in the electron self-energy which results from its interactions with the electromagnetic and electron–positron fields.

1964 E. A. Power Introd. Quantum Electrodynamics i. 7 The modern versions of quantum electrodynamics have enabled a very accurate comparison to be made between theory and experiment. Well-known examples are the Lamb shift energy splitting of the 2S_½ and 2P_½ levels in hydrogen and the radiative corrections to the magnetic moment of the electron.

1970 G. K. Woodgate Elem. Atomic Struct. iv. 69 Figure 4.3 shows the fine structure of the n = 2 and n = 3 levels of hydrogen, modified to take account of the Lamb shift.

1973 McGraw-Hill Yearbk. Sci. & Technol. 111/1 Experimental programs to measure heavy-ion Lamb shifts are now in progress.

This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2022).

单词	lamb shift
释义	Lamb shiftn. Brit. /ˈlam ʃɪft/, U.S. /ˈlæm ˌʃɪft/ Etymology: < the name of Willis E. Lamb (1913–2008), U.S. physicist (who with R. C. Retherford demonstrated the effect in 1947) + shift n. Physics. A displacement of energy levels in hydrogen and hydrogen-like atoms such that those with the same values of the quantum numbers n and j but different values of l are not coincident, as predicted by Dirac's theory, but separated by a very small amount (the level with the lower value of l being the higher). ΚΠ 1948 Physical Rev. 74 1157 The effects treated are the Lamb shift, the correction of the g-factor..and the correction of the Compton scattering cross section. 1950 Physical Rev. 77 745 (heading) Departure of the Lamb shift from the h⁻³ law in He⁺. 1958 E. U. Condon & H. Odishaw Handbk. Physics vii. iv. 63/1 The Lamb shift has been interpreted..as resulting from changes in the electron self-energy which results from its interactions with the electromagnetic and electron–positron fields. 1964 E. A. Power Introd. Quantum Electrodynamics i. 7 The modern versions of quantum electrodynamics have enabled a very accurate comparison to be made between theory and experiment. Well-known examples are the Lamb shift energy splitting of the 2S_½ and 2P_½ levels in hydrogen and the radiative corrections to the magnetic moment of the electron. 1970 G. K. Woodgate Elem. Atomic Struct. iv. 69 Figure 4.3 shows the fine structure of the n = 2 and n = 3 levels of hydrogen, modified to take account of the Lamb shift. 1973 McGraw-Hill Yearbk. Sci. & Technol. 111/1 Experimental programs to measure heavy-ion Lamb shifts are now in progress. This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2022). > as lemmas Lamb shift Lamb shift n. [demonstrated by Lamb and R. C. Retherford in 1947] a displacement of energy levels in hydrogen and hydrogen-like atoms such that those with the same values of the quantum numbers n and j but different values of l are not coincident, as predicted by Dirac's theory, but separated by a very small amount (the level with the lower value of l being the higher).extracted from Lambn.² < n.1948 as lemmas
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Lamb shiftn.

> as lemmas