Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, Prague 18000, Czech Republic.
Max Planck Institute for Extraterrestrial Physics, Gießenbachstraße 1, 85748 Garching, Germany.
J Chem Phys. 2023 Jun 28;158(24). doi: 10.1063/5.0153699.
The experimental determination of the reaction rate coefficients for production and destruction of HCN+ and HNC+ in collision with H2 is presented. A variable-temperature, 22-pole radio frequency ion trap was used to study the reactions in the temperature range 17-250 K. The obtained rate coefficients for the reaction of CN+ and HCN+ with H2 are close to the collisional (Langevin) value, whereas that for the reaction of HNC+ with H2 is quickly decreasing with increasing temperature. The product branching ratios for the reaction of CN+ with H2 are also reported and show a notable decrease of the HNC+ product with respect to the HCN+ product with increasing temperature. These measurements have consequences for current astrochemical models of cyanide chemistry, in particular, for the HCNH+ cation.
本文介绍了在 H2 碰撞中生成和破坏 HCN+ 和 HNC+ 的反应速率系数的实验测定。使用可变温度的 22 极射频离子阱在 17-250 K 的温度范围内研究了这些反应。得到的 CN+ 和 HCN+ 与 H2 的反应速率系数接近碰撞（朗之万）值，而 HNC+ 与 H2 的反应速率系数随温度升高迅速下降。还报道了 CN+ 与 H2 的反应的产物分支比，结果表明随着温度的升高，HNC+产物相对于 HCN+产物明显减少。这些测量结果对当前氰化物化学的天体化学模型，特别是对 HCNH+阳离子，有重要影响。
