在开放的离子轨迹模拟框架中基于离子中性碰撞的分子动力学建模
Michelle Rajkovic1, Thorsten Benter1, Walter Wißdorf1
1Department of Physical and Theoretical Chemistry, University of Wuppertal, Gaussstraße 20, 42119 Wuppertal, Germany.
Journal of the American Society for Mass Spectrometry
|September 13, 2023
概括
这项研究引入了对离子动力学模拟的先进碰撞模型,通过使用分子动力学显著改善了对离子运动的预测. 这提高了对离子移动性光谱 (IMS) 和离子移动性质谱 (IMS-MS) 模拟的准确性.
科学领域:
- 分析化学 分析化学
- 计算化学计算化学
- 物理化学 物理化学
背景情况:
- 离子移动光谱 (IMS) 和IMS-MS对于分析气相分析物结构至关重要.
- 准确模拟离子中性相互作用对于现代IMS和IMS-MS系统至关重要.
- 像SIMION这样的模拟器中现有的碰撞模型 (硬球,扩散) 由于简化假设而存在局限性,影响了预测准确性.
研究的目的:
- 将开源的离子动力学模拟框架 (IDSimF) 扩展为一个先进的碰撞模型.
- 为了能够在任意和不平衡条件下模拟离子动力学.
- 在离子轨迹模拟中使用分子动力学 (MD) 轨迹方法提供离子中性碰撞的详细显微镜描述.
主要方法:
- 将离子动力学模拟框架 (IDSimF) 扩展为基于分子动力学 (MD) 轨迹的碰撞模型.
- 在各种条件下模拟离子动力学,包括不平衡.
- 使用漂移管离子移动性光谱学 (DT-IMS) 实验进行验证,并与硬球模型进行比较.
主要成果:
- 与硬球模型相比,新的MD碰撞模型显著改善了离子流动性预测.
- 模拟的高场离子流动性显示,与实验值的偏差仅为少数百分比.
- 估计了生产模拟的运行时间要求.
结论:
- 开发的MD碰撞模型提供了高质量的离子流动性预测,特别是在非平衡条件下.
- 这种先进的模型提高了IMS和IMS-MS的离子轨迹模拟的准确性.
- 公共可用的MD碰撞模型作为未来发展离子动力学建模的基础.
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