灵活的全原子系统在任意场的离子流动性计算使用两个温度理论
Farah Mubas-Sirah1, Viraj D Gandhi1,2, Mohsen Latif1
1Department of Mechanical Engineering, Indiana University - Purdue University Indianapolis, Indianapolis, IN, USA. clarriba@iupui.edu.
Physical chemistry chemical physics : PCCP
|January 16, 2024
概括
这项研究引入了一种用于在高电场下进行离子移动性光谱 (IMS) 计算的新方法. 增强方法考虑了离子结构的变化,改善了对大型有机离子的实验数据的一致性.
科学领域:
- 物理化学 物理化学
- 分析化学 分析化学
- 计算化学的计算化学
背景情况:
- 离子运动谱法 (IMS) 通过离子在电场下的气体运动来分离离子.
- 现有的离子流动性的双温度理论对多原子离子和气体有局限性,特别是在高电场下.
- 以前的研究表明,对于100Td以上的四基盐,理论和实验之间存在偏差.
研究的目的:
- 开发和验证用于离子移动性光谱学的修改高场计算方法.
- 为了研究电场加热导致的离子结构变化对移动性测量的影响.
- 为了改善理论预测和实验数据之间的协议大有机离子.
主要方法:
- 引入了修改后的高场计算方法,将电场引起的离子结构变化纳入其中.
- 四甲 (THA+),四甲 (TDA+) 和四甲 (TDDA+) 离子的分子结构在使用MM2力场的不同温度下生成.
- 使用IMoS 1.13软件计算离子流动性,使用双温度轨迹方法,考虑多种有效温度和线性称量系统.
主要成果:
- 修改后的方法,考虑到离子结构扩大在高场,显示出与实验移动性数据的更好一致.
- FAIMS (现场不对称离子移动光谱) 分散图也表明与实验结果的一致性有所改善.
- 该研究证实,离子结构变化在高电场下显著影响移动性.
结论:
- 电场加热导致的离子结构扩大是高电场中准确的移动性计算的关键因素.
- 开发的方法增强了复杂有机离子离子移动性谱学的预测能力.
- 需要进一步的研究,以充分解决不弹性碰撞的复杂性和离子-气体相互作用中的能量转移.
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