10.6084/m9.figshare.1012752.v1 C Kyriakides C Kyriakides B S Clarke B S Clarke V H S Kwong V H S Kwong The <sup>4</sup>He<sup>+</sup> ion population decay under different Ne pressures (a) and the corresponding decay rates plotted against Ne number densities (b) IOP Publishing 2013 Ne pressures decay rates ion population decay charge transfer rate coefficients N 2 estimate kloss equivalent temperatures co CH 4. Abstract rate coefficient cm Ne number densities Atomic Physics Molecular Physics 2013-09-06 00:00:00 Figure https://iop.figshare.com/articles/figure/_The_sup_4_sup_He_sup_sup_ion_population_decay_under_different_Ne_pressures_a_and_the_corresponding_/1012752 <p><strong>Figure 4.</strong> The <sup>4</sup>He<sup>+</sup> ion population decay under different Ne pressures (a) and the corresponding decay rates plotted against Ne number densities (b). The rate coefficient found in (b) is used to estimate <em>k</em><sub>loss</sub> for CH<sub>4</sub>.</p> <p><strong>Abstract</strong></p> <p>We report our measured values for the sum of single and double charge transfer rate coefficients between <sup>3</sup>He<sup>2 +</sup> and H<sub>2</sub>, CH<sub>4</sub>, N<sub>2</sub> and CO. Our values are 2.4 ± 0.2 <b>×</b> 10<sup>−9</sup> cm<sup>3</sup> s<sup>−1</sup> for H<sub>2</sub>, 6.3 ± 0.9 <b>×</b> 10<sup>−9</sup> cm<sup>3</sup> s<sup>−1</sup> for CH<sub>4</sub>, 4.0 ± 0.3 <b>×</b> 10<sup>−9</sup> cm<sup>3</sup> s<sup>−1</sup> for N<sub>2</sub> and 4.7 ± 0.4 <b>×</b> 10<sup>−9</sup> cm<sup>3</sup> s<sup>−1</sup> for CO. The values are obtained at equivalent temperatures of 1200–2400 K.</p>