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We consider transitions of electron holes (vacancies in otherwise filledshells of atomic systems) in multiply-charged ions that, due to level-crossingof the holes, have frequencies within the range of optical atomic clocks.Strong E1 transitions provide new options for laser-cooling and trapping, whilenarrow transitions can be used for high-precision spectroscopy and tests offundamental physics. We show that hole transitions can have extremely highsensitivity to alpha-variation due to large relativistic corrections, andpropose candidate transitions that have much larger alpha-sensitivities thanany previously seen in atomic systems.

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