The ⁴He⁺ ion population decay under different Ar pressures (a) and the corresponding decay rates plotted against Ar number densities (b)

Figure A4. The ⁴He⁺ ion population decay under different Ar pressures (a) and the corresponding decay rates plotted against Ar number densities (b). The rate coefficient from (b) is used to determine the ECIL rate coefficients of ³He^{2 +}–N₂ and ³He^{2 +}–CO.

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.