| 单词 | perturbation theory |
| 释义 | > as lemmasperturbation theory perturbation theory n. Physics and Mathematics the method of investigating solutions of equations representing physical systems, esp. quantum systems, by relating them by means of perturbations to those of similar but simpler systems which can be solved directly. ΘΚΠ the world > matter > physics > quantum theory > quantum mechanics > wave mechanics > [noun] > perturbation > theory of perturbation theory1926 1926 Proc. Royal Soc. A. 111 301 If the [magnetic] field is weak we may use perturbation theory, according to which the change of energy of the stationary states is given, to the first order, by the constant term in the Fourier expansion of the energy of the perturbation in terms of the uniformising variables for the undisturbed system. 1972 G. E. Brown Many-body Probl. ii. 25 The two types of perturbation theory most commonly used are the Brillouin–Wigner perturbation expansion and the Rayleigh–Schrödinger one. 2000 Proc. National Acad. Sci. U.S.A. 97 9379/1 We use ab initio multiconfigurational second-order perturbation theory to establish the intrinsic photoisomerization path model of retinal chromophores. < as lemmas |
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