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
复制标题
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
影响因子:
1.7
通讯作者:
H. Hasse
中科院分区:
文献类型:
--
作者:
C. Engin;T. Merker;J. Vrabec;H. Hasse
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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