| 单词 | spectral term |
| 释义 | > as lemmasspectral term spectral term n. (See term n. 14d). spectral term d. Physics. Originally (in spectroscopy): each of a set of numbers determined for a given spectrum in such a way that the wave number of each observed spectral line can be written as the difference between two such numbers (now rare). In later use (in quantum physics): each set of atomic states for a given atom in which every state has the same energy, configuration of electrons, orbital quantum number, and spin quantum number; cf. term symbol n. (b) at Compounds 4. Also more fully spectral term, atomic term. ΘΚΠ the world > matter > physics > atomic physics > [noun] > atomic state term1915 the world > matter > physics > atomic physics > decomposition of light, spectrum > [noun] > component of wave number term1915 1915 Astrophysical Jrnl. 41 324 The difference in ‘wave-number’..between the limit of the series and each member is called the ‘term’... The limit itself is commonly a ‘term’ of some other series. 1922 A. D. Udden tr. N. Bohr Theory of Spectra ii. ii. 30 The arrangement of the states in horizontal rows corresponds to the ordinary arrangement of the ‘spectral terms’ in the spectroscopic tables. 1935 W. M. Hicks Struct. Spectral Terms i. 1 Any given term in a neutral spectrum is expressible in the form R/(m + ϕ)2, where R is a constant..m is an ordinal integer and ϕ a fraction which depends on m. 1970 G. K. Woodgate Elem. Atomic Struct. vii. 110 For calcium..the 3P and 1P terms of the configuration 4s4p are separated by about 8,000 cm−1. 2015 J. Collins in B. di Bartolo et al. Nano-structures for Optics & Photonics xvi. 341 The configuration is accordingly split into different spectral terms, each term having a specific total angular momentum. < as lemmas |
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