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

Figure A3. The ³He^{2 +} ion population decay under different CO pressures (a) and the corresponding decay rates plotted against CO 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.