intercombinationn.

/ˌɪntəkɒmbɪˈneɪʃən/

Etymology: < inter- prefix + combination n.

(See inter- prefix 1b(a)) spec. in Physics, an electronic transition between atomic states of different multiplicities (i.e. having different spin quantum numbers); also elliptical for intercombination line n. a spectral line so produced.

ΘΚΠ

the world > matter > physics > quantum theory > electron spin > multiplet > [noun] > number of components in > transfer maintaining > transfer not maintaining

intercombination1930

1930 A. E. Ruark & H. C. Urey Atoms, Molecules & Quanta xx. 705 When intercombination lines occur, the intensity rules considered in this section must be modified.

1934 O. W. Richardson Molecular Hydrogen iii. 46 There may be intercombination lines between the singlet and triplet states but if so they must be very faint.

1937 J. W. T. Spinks tr. G. Herzberg Atomic Spectra ii. 79 Terms of the triplet system of He practically do not combine with the terms of the singlet system, and conversely. That is, a prohibition of intercombinations is observed.

1941 Rev. Mod. Physics XIII. 75 Intercombinations may occur with appreciable intensity only if the molecule contains some heavier atoms.

1950 Discussions Faraday Soc. IX. 16 To identify spectroscopically the long-lived luminescence and converse absorption bands as intercombinations, use is made of the characteristics of the spin-orbit coupling process.

1970 G. K. Woodgate Elem. Atomic Struct. vii. 132 When S changes one speaks of intercombination lines.

This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2019).

单词	intercombination
释义	intercombinationn. /ˌɪntəkɒmbɪˈneɪʃən/ Etymology: < inter- prefix + combination n. (See inter- prefix 1b(a)) spec. in Physics, an electronic transition between atomic states of different multiplicities (i.e. having different spin quantum numbers); also elliptical for intercombination line n. a spectral line so produced. ΘΚΠ the world > matter > physics > quantum theory > electron spin > multiplet > [noun] > number of components in > transfer maintaining > transfer not maintaining intercombination1930 1930 A. E. Ruark & H. C. Urey Atoms, Molecules & Quanta xx. 705 When intercombination lines occur, the intensity rules considered in this section must be modified. 1934 O. W. Richardson Molecular Hydrogen iii. 46 There may be intercombination lines between the singlet and triplet states but if so they must be very faint. 1937 J. W. T. Spinks tr. G. Herzberg Atomic Spectra ii. 79 Terms of the triplet system of He practically do not combine with the terms of the singlet system, and conversely. That is, a prohibition of intercombinations is observed. 1941 Rev. Mod. Physics XIII. 75 Intercombinations may occur with appreciable intensity only if the molecule contains some heavier atoms. 1950 Discussions Faraday Soc. IX. 16 To identify spectroscopically the long-lived luminescence and converse absorption bands as intercombinations, use is made of the characteristics of the spin-orbit coupling process. 1970 G. K. Woodgate Elem. Atomic Struct. vii. 132 When S changes one speaks of intercombination lines. This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2019). > as lemmas intercombination intercombination n. Brit. /ˌɪntəkɒmbᵻˈneɪʃn/ , U.S. /ˌɪn(t)ərˌkɑmbəˈneɪʃən/ Π 1866 Athenæum 23 July 838/1 Changes..made by the intercombination, in varying proportions, of a few proximate elements. extracted from inter-prefix < n.1930 as lemmas
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intercombinationn.

> as lemmas