| 单词 |
intercombination |
| 释义 |
intercombination|ˌɪntəkɒmbɪˈneɪʃən|
[f. inter- + combination.]
(See inter- 2 a.) spec. in Physics, an electronic transition between atomic states of different multiplicities (i.e. having different spin quantum numbers); also ellipt. for intercombination line, a spectral line so produced.
1930Ruark & Urey Atoms, Molecules & Quanta xx. 705 When intercombination lines occur, the intensity rules considered in this section must be modified. 1934O. 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. 1937J. W. T. Spinks tr. Herzberg's Atomic Spect. & Atomic Struct. 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. 1941Rev. Mod. Physics XIII. 75 Intercombinations may occur with appreciable intensity only if the molecule contains some heavier atoms. 1950Discussions 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. 1970G. K. Woodgate Elem. Atomic Struct. vii. 132 When S changes one speaks of intercombination lines. |
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