In High Kinetic Energy Ion Mobility Spectrometry (HiKE-IMS), ions are formed in a reaction region and separated in a drift region, which is similar to classical drift tube ion mobility spectrometers (IMS) operated at ambient pressure. However, in contrast to the latter, the HiKE-IMS is operated at a decreased background pressure of 10-40 mbar and achieves high reduced electric field strengths of up to 120 Td in both the reaction and the drift region. Thus, the HiKE-IMS allows insights into the chemical kinetics of ion-bound water cluster systems at effective ion temperatures exceeding 1000 K, although it is operated at the low absolute temperature of 45 °C. In this work, a HiKE-IMS with a high resolving power of RP = 140 is used to study the dependence of reduced ion mobilities on the drift gas humidity and the effective ion temperature for the positive reactant ions H3O+(H2O)n, O2+(H2O)n, NO+(H2O)n, NO2+(H2O)n, and NH4+(H2O)n, as well as the negative reactant ions O2-(H2O)n, O3-(H2O)n, CO3-(H2O)n, HCO3-(H2O)n, and NO2-(H2O)n. By varying the reduced electric field strength in the drift region, cluster transitions are observed in the ion mobility spectra. This is demonstrated for the cluster systems H3O+(H2O)n and NO+(H2O)n.

中文翻译：

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高动能离子迁移谱（HiKE-IMS）中空气和氮气中正负离子在场中的减少的离子迁移率

在高动能离子迁移谱仪（HiKE-IMS）中，离子在反应区中形成并在漂移区中分离，这类似于在环境压力下运行的经典漂移管离子迁移谱仪（IMS）。但是，与后者相反，HiKE-IMS在10至40毫巴的降低背景压力下运行，并且在反应区和漂移区均实现了高达120 Td的高降低电场强度。因此，尽管HiKE-IMS是在45°C的低绝对温度下运行的，但它可以使离子束缚水簇系统在超过1000 K的有效离子温度下的化学动力学见解。在这项工作中 使用具有RP = 140的高分辨率的HiKE-IMS研究正反应离子H3O +（H2O）n，O2 +（H2O）n的降低的离子迁移率对漂移气体湿度和有效离子温度的依赖性， NO +（H2O）n，NO2 +（H2O）n和NH4 +（H2O）n以及负反应离子O2-（H2O）n，O3-（H2O）n，CO3-（H2O）n，HCO3-（ H2O）n和NO2-（H2O）n。通过改变漂移区中降低的电场强度，可以在离子迁移谱中观察到簇跃迁。对于群集系统H3O +（H2O）n和NO +（H2O）n证明了这一点。在离子迁移谱中观察到团簇跃迁。对于群集系统H3O +（H2O）n和NO +（H2O）n证明了这一点。在离子迁移谱中观察到团簇跃迁。对于群集系统H3O +（H2O）n和NO +（H2O）n证明了这一点。