Russell–Saundersn.
/ˌrʌslˈsɔːndəz/, U.S. /ˌrəsəlˈsɔndərz/ Physics.
1. Relating to or involving Russell–Saunders coupling.
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1926 Proc. National Acad. Sci. U.S.A. 12 146 Other analogous molecules containing one unused valence electron, may be of the nature of 2S states (Russell-Saunders notation).
1935 E. U. Condon & G. H. Shortley Theory Atomic Spectra vii. 208 The Russell–Saunders terms corresponding to the configurations sx and px.
1988 Jrnl. Magnetism & Magn. Materials 76–7 393/2 Transitions in Pr between pure Russell–Saunders states.
2002 J. M. Hollas Basic Atomic & Molecular Spectrosc. iv. 45 The Russell–Saunders approximation is appropriate for most states of most atoms, and is the only one that we shall consider here.
2. Russell–Saunders coupling n. = LS-coupling at L n. 6b.
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the world > matter > physics > quantum theory > electron spin > multiplet > [noun] > approximation in description
Russell–Saunders coupling1928
1928 L. Pauling in Proc. National Acad. Sci. U.S.A. 14 359 The number of electrons with such unpaired spins in an atom is, in the case of Russell-Saunders coupling, equal to 2s.
1961 S. Walker & H. Straw Spectrosc. i. i. 87 It will be assumed..that Russell–Saunders coupling applies to the individual momentum vectors associated with the electrons.
1978 Science 14 July 117/2 The resultant spin is only 0, the Russell-Saunders coupling is broken up, and the part of the energy not associated with the crystalline field is raised.
2003 W. P. Risk et al. Compact Blue-green Lasers vii. 314 Russell–Saunders coupling works well for the unfilled shells of light atoms where the Coulomb interaction dominates.
This entry has been updated (OED Third Edition, March 2011; most recently modified version published online March 2022).
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