The ³He^{2 +} ion population decay under different N₂ pressures (a) and the corresponding decay rates plotted against N₂ number densities (b)

Figure A2. The ³He^{2 +} ion population decay under different N₂ pressures (a) and the corresponding decay rates plotted against N₂ number densities (b).

Abstract

We report our measured values for the sum of single and double charge transfer rate coefficients between ³He^{2 +} and H₂, CH₄, N₂ and CO. Our values are 2.4 ± 0.2 × 10⁻⁹ cm³ s⁻¹ for H₂, 6.3 ± 0.9 × 10⁻⁹ cm³ s⁻¹ for CH₄, 4.0 ± 0.3 × 10⁻⁹ cm³ s⁻¹ for N₂ and 4.7 ± 0.4 × 10⁻⁹ cm³ s⁻¹ for CO. The values are obtained at equivalent temperatures of 1200–2400 K.