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When a single trapped ion is laser excited to a metastable state, its "quantum jump" inhibits the laserexcited light scattering on a resonance line. This event, and its inverse, modifies the distribution over the oscillator levels (n) of the ion's vibration in the trap. In particular, unsuccessful attempts to deexcite on vibrational sidebands decrease (n) to sub-Doppler values and may leave the ion in a "trapped" Fock state decoupled from the light. PACS numbers: 32.80.Pj Manipulation and control of trapped ions by the interaction with coherent light includes the reduction of their kinetic energy and energy spread, or optical cooling

The emission spectrum of the bichromatically excited resonance fluorescence of a single atomic particle, i.e. of a permanently trapped and cooled Ba + ion has been recorded. It shows up to five peaks, two of them partially resolved, in agreement with fluorescence spectra of three-level atoms calculated from sets of parameters separately measured from recorded excitation spectra of the integrated fluorescence.

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