Atoms, Volume 7, Issue 4 (December 2019) – 15 articles
Cover Story (view full-size image): Charge exchange (CX) is important for understanding both astrophysical and atmospheric plasmas. CX experiments have focused primarily on understanding the total CX cross-section. Using a gas cell which features a short, high-pressure interaction region, we report total CX cross-sections via an attenuation method for noble gas ions (He, Ne, Ar, Kr) in collision with molecular nitrogen between 0.2 and 5.0 keV. In any CX measurement, the total cross-section may be complicated by elastic and inelastic reaction channels. The large angular acceptance of our apparatus limits the effect of this non-CX scatter, but comparisons to previous experiments are suggestive of a non-negligible contribution from large-angle (θ>13°) scattering. A second gas cell, featuring a novel deceleration scheme, is proposed for future CX measurements. View this paper
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