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The $alpha$-dependence of transition frequencies for ions Si II, Cr II, Fe II, Ni II, and Zn II | | V. A. Dzuba
; V. V. Flambaum
; M. G. Kozlov
; M. Marchenko
; | | Date: |
28 Dec 2001 | | Journal: | Phys.Rev. A66 (2002) 022501 DOI: 10.1103/PhysRevA.66.022501 | | Subject: | Atomic Physics | physics.atom-ph astro-ph | | Abstract: | We performed accurate calculation of $alpha$-dependence ($alpha=e^2/hc$) of the transition frequencies for ions, which are used in a search for the variation of the fine structure constant $alpha$ in space-time. We use Dirac-Hartree-Fock method as a zero approximation and then the many-body perturbation theory and configuration interaction methods to improve the results. An important problem of level pseudocrossing (as functions of $alpha$) is considered. Near the crossing point the derivative of frequencies over $alpha$ varies strongly (including change of the sign). This makes it very sensitive to the position of the crossing point. We proposed a semiempirical solution of the problem which allows to obtain accurate results. | | Source: | arXiv, physics/0112093 | | Services: | Forum | Review | PDF | Favorites | |
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