Bones David L, Daly Shane M, Mangan Thomas P, Plane John M C
School of Chemistry, University of Leeds, Leeds, UK.
Phys Chem Chem Phys. 2020 Apr 29;22(16):8940-8951. doi: 10.1039/d0cp01124j.
The reactions between Ni+(2D) and O3, O2, N2, CO2 and H2O were studied at 294 K using the pulsed laser ablation at 532 nm of a nickel metal target in a fast flow tube, with mass spectrometric detection of Ni+ and NiO+. The rate coefficient for the reaction of Ni+ with O3 is k(294 K) = (9.7 ± 2.1) × 10-10 cm3 molecule-1 s-1; the reaction proceeds at the ion-permanent dipole enhanced Langevin capture rate with a predicted T-0.16 dependence. Electronic structure theory calculations were combined with Rice-Ramsperger-Kassel-Markus theory to extrapolate the measured recombination rate coefficients to the temperature and pressure conditions of planetary upper atmospheres. The following low-pressure limiting rate coefficients were obtained for T = 120-400 K and He bath gas (in cm6 molecule-2 s-1, uncertainty ±σ at 180 K): log10(k, Ni+ + N2) = -27.5009 + 1.0667log10(T) - 0.74741(log10(T))2, σ = 29%; log10(k, Ni+ + O2) = -27.8098 + 1.3065log10(T) - 0.81136(log10(T))2, σ = 32%; log10(k, Ni+ + CO2) = -29.805 + 4.2282log10(T) - 1.4303(log10(T))2, σ = 28%; log10(k, Ni+ + H2O) = -24.318 + 0.20448log10(T) - 0.66676(log10(T))2, σ = 28%). Other rate coefficients measured (at 294 K, in cm3 molecule-1 s-1) were: k(NiO+ + O) = (1.7 ± 1.2) × 10-10; k(NiO+ + CO) = (7.4 ± 1.3) × 10-11; k(NiO+ + O3) = (2.7 ± 1.0) × 10-10 with (29 ± 21)% forming Ni+ as opposed to NiO2+; k(NiO2+ + O3) = (2.9 ± 1.4) × 10-10, with (16 ± 9)% forming NiO+ as opposed to ONiO2+; and k(Ni+·N2 + O) = (7 ± 4) × 10-12. The chemistry of Ni+ and NiO+ in the upper atmospheres of Earth and Mars is then discussed.
在294 K温度下，使用532 nm脉冲激光烧蚀镍金属靶，在快速流动管中研究了Ni+(2D)与O3、O2、N2、CO2和H2O之间的反应，并通过质谱检测Ni+和NiO+。Ni+与O3反应的速率系数为k(294 K) = (9.7 ± 2.1) × 10-10 cm3分子-1 s-1；该反应以离子-永久偶极增强朗之万俘获速率进行，预测其与T-0.16相关。将电子结构理论计算与赖斯-拉姆珀格-卡斯尔-马库斯理论相结合，将测得的复合速率系数外推到行星高层大气的温度和压力条件。对于T = 120 - 400 K和氦气缓冲气体，得到了以下低压极限速率系数（单位为cm6分子-2 s-1，180 K时不确定性为±σ）：log10(k, Ni+ + N2) = -27.5009 + 1.0667log10(T) - 0.74741(log10(T))2，σ = 29%；log10(k, Ni+ + O2) = -27.8098 + 1.3065log10(T) - 0.81136(log10(T))2，σ = 3
