Flexible or rigid molecular models? A study on vapour–liquid equilibrium properties of ammonia

Flexible or rigid molecular models? A study on vapour–liquid equilibrium properties of ammonia
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灵活的还是刚性的分子模型?

DOI:
10.1080/00268976.2010.542894
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发表时间:
2011
期刊:
影响因子:
1.7
通讯作者:
H. Hasse
H. Hasse
中科院分区:
化学4区
文献类型:
--
作者:
C. Engin;T. Merker;J. Vrabec;H. Hasse

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研究了分子内自由度对氨气相压力、饱和密度和汽化热等汽液平衡性质的影响。在保持所有其他参数不变的情况下,具有和不具有分子内自由度的分子力场显示出显著不同的相包络。对于氨来说,角势特别重要,因为氢在液体中的位置比在蒸汽中更排列,导致凝聚相中分子偶极矩显著增强。基于我们小组先前工作中的氨的刚性力场[Eacklet al.,Mol.Phys.106,1039(2008)],发展了一种新的具有分子内自由度的精确力场。
The influence of the intramolecular degrees of freedom on the vapour–liquid equilibrium properties of ammonia is studied for vapour pressure, saturated densities and enthalpy of vaporization. Molecular force fields with and without intramolecular degrees of freedom, keeping all other parameters unchanged, show significantly different phase envelopes. For ammonia, the angle potential is particularly important, because the hydrogen sites are more aligned in the liquid than in the vapour, leading to a significantly enhanced molecular dipole moment in the condensed phase. Based on a rigid force field for ammonia from prior work of our group [Ecklet al., Mol. Phys.106, 1039 (2008)], a new accurate force field with intramolecular degrees of freedom is developed.
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