Hole transitions in multiply-charged ions for precision laser spectroscopy and searching for alpha-variation

Abstract

We consider transitions of electron holes (vacancies in otherwise filled shells of atomic systems) in multiply-charged ions that, due to level-crossing of the holes, have frequencies within the range of optical atomic clocks. Strong E1 transitions provide new options for laser-cooling and trapping, while narrow transitions can be used for high-precision spectroscopy and tests of fundamental physics. We show that hole transitions can have extremely high sensitivity to alpha-variation due to large relativistic corrections, and propose candidate transitions that have much larger alpha-sensitivities than any previously seen in atomic systems.

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• Enhanced effect of temporal variation of the fine structure constant in diatomic molecules
• Enhanced laboratory sensitivity to variation of the fine-structure constant using highly-charged ions
• Astronomical and laboratory searches for space-time variation of fundamental constants
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