Towards Xenon Neutral Density Measurements Using Radar REMPI Radar REMPI is a microwave-scattering-based resonance-enhanced multiphoton ionization

Radar REMPI is a microwave-scattering-based resonance-enhanced multiphoton ionization diagnostic technique [1] which has been applied to detect trace species in air [2], measure electron loss rates [3], and measure temperature in gas mixtures and flames [4]. The resonance enhanced technique provides high selectivity in measuring species of interest, and hence can be used to measure the density of a neutral species in plasma (in Hall thrusters, for instance) and can also be used for remote magnetometry [5]. The diagnostic technique has a measurement time on the order of tens of nanoseconds and a sample volume length scale of less than 1 mm, allowing timeand spaceresolved measurements.