Charge exchange of H+, H2+, H3+ at energies of 1–30 keV in sodium

Add time:07/26/2019    Source:sciencedirect.com

Charge-exchange reactions of H+, H2+ and H3+ at energies of 1–30 keV in sodium vapor were studied using the charge-exchange canal of a 2 × 1 MV tandem accelerator. Ion optics simulations were performed before measurements to ensure high beam transport efficiency in the beamline. The density of sodium vapor was calibrated with published attenuation cross-section data of He+-Na. Total attenuation cross sections of all the three species were acquired, among which, the data for H+ agree well with the existing data and those for H2+, H3+ were first measured. In the relatively high energy range (above 3 keV/amu), the total attenuation cross-sections appear to be independent of incident ion species; however, the curves for different ion species show different tendencies in the low energy part. Besides, the yields of negative ions were also obtained. It appears that H+ is most efficient to produce H− compared with H2+ and H3+.

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