Abstract
The laser-induced fluorescence (LIF) diagnostic is a powerful non-intrusive tool to obtain velocity distribution function of ions or atoms, with a good time ( ≈µs) and space ( ≈0.1mm) resolution. LIF uses the optical pumping of an ion or atom transition by a laser frequency shifted by Doppler effect: if ω L is the laser frequency, ω 0 the ion or atom transition frequency at rest, and v the ion or atom velocity along the laser beam equations. The level of LIF emitted by ions or atoms inside the probed volume is recorded, and by scanning the laser frequency we obtain a fluorescence signal proportional to the number of pumped ions or atoms, i.e. at the resonant velocity and consequently the velocity distribution function along the laser beam for the probed species.
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