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Electric propulsion requires exhaustive ground test campaigns to obtain anaccurate characterization of the propulsion devices, or thrusters, used by thespacecraft. Among the many plasma parameters, accurately measured during thetests, that of the ion velocity is key, and can be measured using non-intrusivetools such as Laser-Induced Fluorescence (LIF) diagnostics. The ion velocity isinferred by Doppler shift measurements that presupposes a precise and accurateknowledge of the wavelength of excitation of the ions at rest. Today electricpropulsion is moving towards the use of Krypton as a propellant, due to thedramatic increase in cost of the more advantageous Xenon gas propellant,commonly used until now. In this work the4d$^4D_{7/2}\rightarrow$5p$^4P^\circ_{5/2}$ transition of Kr II is used for LIFdiagnostic in hollow cathode discharge.

Laser-induced fluorescence detection of the 4d$^4D_{7/2}\rightarrow$5p$^4P^\circ_{5/2}$ transition of Kr II in a hollow cathode discharge