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一个快速的,方便的,分子动力学的可极化静电模型
Liangyue Wang1, Michael Schauperl2, David L Mobley3
1Department of Chemistry and Biochemistry, University of California, San Diego, California 92093, United States.
我们为分子动力学 (MD) 模拟开发了一种高效的极化静电模型. 该模型使用RESP-dPol和AM1-BCC-dPol方法,与非极化力场相比,提高了有机液体的精度.
科学领域:
- 计算化学计算化学
- 分子动力学模拟模型
- 物理化学 物理化学
背景情况:
- 精确的分子建模需要精确的静电相互作用.
- 现有的非极化力场往往难以捕捉静电电位的细微差别.
- 极化力场的开发对于提高模拟精度至关重要.
研究的目的:
- 为分子动力学 (MD) 模拟引入一个高效的可极化静电模型.
- 提供两种新的方法,RESP-dPol和AM1-BCC-dPol,用于在可两极分化的框架内分配部分费用.
- 为了能够准确地复制气相量子力学静电潜力.
主要方法:
- 利用类型化,以原子为中心的极化性和计算效率的快速直接近似.
- 开发了RESP-dPol作为RESP收费模型的概括.
- 调整了AM1-BCC方法为AM1-BCC-dPol用于可极化模拟.
- 参数化了含有C,N,O和H元素的分子模型.
主要成果:
- 基准测试显示,与气相二极子时刻和分子极化性有很好的一致性.
- 该模型对于有机液体的静电介电常数与非极化力场相比,取得了明显更准确的结果.
- 与固定电荷模型相比,MD模拟运行效率高,速度仅增加了3.6倍.
结论:
- RESP-dPol和AM1-BCC-dPol在固定电荷力场上提供了更好的精度.
- 这些方法可以作为开发通用,负担得起和可转移的极化力场的出色起点.
- 实施的软件与开放力场倡议集成,促进进一步的开发和勘探.
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