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We consider pump-probe spectroscopy of a single ion with a highly metastable(probe) clock transition which is monitored by using the quantum jumptechnique. For a weak clock laser we obtain the well known Autler-Townessplitting. For stronger powers of the clock laser we demonstrate the transitionto a new regime. The two regimes are distinguished by the transition of twocomplex eigenvalues to purely imaginary ones which can be very different inmagnitude. The transition is controlled by the power of the clock laser. Forpump on resonance we present simple analytical expressions for variouslinewidths and line positions.Comment: 6 figures. accepted for publication in PR

Quantum coherence in a single ion due to strong excitation of a metastable transition