Lochmann Christine, Melath Sruthi Purushu, Hauck Michael, Wild Robert, Wester Roland
Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstrasse 25/3, 6020 Innsbruck, Austria.
J Phys Chem A. 2025 Jan 9;129(1):103-108. doi: 10.1021/acs.jpca.4c06626. Epub 2024 Dec 20.
We report on the temperature-dependent reactions of the carbon-chain anions C and C, as well as the hydrocarbons CH and CH with H atoms in the temperature regime between 8 and 296 K. The experiments have been carried out in a temperature-variable radiofrequency multipole ion trap. From the measured kinetics, we have derived reaction rate coefficients that are constant for all considered systems in the measured temperature regime. For the C, C, and CH anions, the values are about a factor of 2 smaller than the Langevin capture rate coefficient, while for CH, the measured value agrees with the Langevin value. No theoretical calculations are available at present to explain this. All rate coefficients are in good agreement with previous measurements at room temperature.
我们报道了在8至296K温度范围内，碳链阴离子C⁻和C₂⁻以及碳氢化合物CH₃⁻和CH₂⁻与氢原子的温度依赖反应。实验在可变温度射频多极离子阱中进行。从测量的动力学数据中，我们得出了在所测量温度范围内所有考虑系统均恒定的反应速率系数。对于C⁻、C₂⁻和CH₃⁻阴离子，其值比朗之万捕获速率系数小约2倍，而对于CH₂⁻，测量值与朗之万值相符。目前尚无理论计算来解释这一点。所有速率系数与先前在室温下的测量结果高度一致。
