Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-01-21
Phys.Rev.A71:052509,2005
Astronomy and Astrophysics
Astrophysics
5 pages, 3 tables, 1 figure, submitted to Phys. Rev. A
Scientific paper
10.1103/PhysRevA.71.052509
Sensitivity of atomic transition frequencies to variation of the fine structure constant $\alpha=e^2/\hbar c$ increases proportional to $Z^2$ where $Z$ is the nuclear charge. Recently several lines of heavy ions Ge II, Sn II and Pb II have been detected in quasar absorption spectra. We have performed accurate many-body calculations of $\alpha^2$-dependence of transition frequencies ($q$-coefficients) for these atoms and found an order of magnitude increase in sensitivity in comparison with atomic transitions which were previously used to search for temporal and spatial variation of $\alpha$ in quasar absorption systems. An interesting feature in Pb II is highly non-linear dependence on $\alpha^2$ due to the level pseudo-crossings.
Dzuba V. A.
Flambaum Victor V.
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