Vibrational Anharmonicity and Harmonic Force Fields for Dichloromethane from Quantum-Chemical Calculations

2008 ◽  
Vol 112 (40) ◽  
pp. 10006-10016 ◽  
Author(s):  
Donald C. McKean ◽  
Norman C. Craig ◽  
Mark M. Law
Keyword(s):  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Force Fields ◽  
Harmonic Force ◽  
Vibrational Anharmonicity

scholarly journals Polarizable force fields based on physical models and quantum chemical calculations

2014 ◽  
Vol 115 (9) ◽  
pp. 545-549 ◽  
Author(s):  
Xingyong Wang ◽  
Tianying Yan ◽  
Jing Ma
Keyword(s):  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Force Fields ◽  
Physical Models ◽  
Polarizable Force Fields

Transferability of different classical force fields for right and left handed α-helices constructed from enantiomeric amino acids

2016 ◽  
Vol 18 (7) ◽  
pp. 5550-5563 ◽  
Author(s):  
Santu Biswas ◽  
Sujit Sarkar ◽  
Prithvi Raj Pandey ◽  
Sudip Roy
Keyword(s):  
Amino Acids ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Force Fields ◽  
Left Handed ◽  
Helical Peptide ◽  
Left And Right ◽  
Alpha Helical Peptide

The energetic differences between left and right handed alpha helical peptide chains constructed from enantiomeric amino acids are investigated using quantum chemical calculations.

Scaled Quantum Chemical Force Fields for 1,1-Difluorocyclopropane and the Influence of Vibrational Anharmonicity

2008 ◽  
Vol 112 (29) ◽  
pp. 6760-6771 ◽  
Author(s):  
Donald C. McKean ◽  
Norman C. Craig ◽  
Mark M. Law
Keyword(s):  
Quantum Chemical ◽  
Force Fields ◽  
Vibrational Anharmonicity ◽  
Chemical Force

scholarly journals Molecular simulation of the thermophysical properties and phase behaviour of impure CO2 relevant to CCS

2016 ◽  
Vol 192 ◽  
pp. 415-436 ◽  
Author(s):  
Alexander J. Cresswell ◽  
Richard J. Wheatley ◽  
Richard D. Wilkinson ◽  
Richard S. Graham
Keyword(s):  
Physical Properties ◽  
Force Field ◽  
Ab Initio ◽  
Molecular Simulation ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Force Fields ◽  
Phase Behaviour ◽  
Suitable Model ◽  
Wide Range

Impurities from the CCS chain can greatly influence the physical properties of CO2. This has important design, safety and cost implications for the compression, transport and storage of CO2. There is an urgent need to understand and predict the properties of impure CO2 to assist with CCS implementation. However, CCS presents demanding modelling requirements. A suitable model must both accurately and robustly predict CO2 phase behaviour over a wide range of temperatures and pressures, and maintain that predictive power for CO2 mixtures with numerous, mutually interacting chemical species. A promising technique to address this task is molecular simulation. It offers a molecular approach, with foundations in firmly established physical principles, along with the potential to predict the wide range of physical properties required for CCS. The quality of predictions from molecular simulation depends on accurate force-fields to describe the interactions between CO2 and other molecules. Unfortunately, there is currently no universally applicable method to obtain force-fields suitable for molecular simulation. In this paper we present two methods of obtaining force-fields: the first being semi-empirical and the second using ab initio quantum-chemical calculations. In the first approach we optimise the impurity force-field against measurements of the phase and pressure–volume behaviour of CO2 binary mixtures with N2, O2, Ar and H2. A gradient-free optimiser allows us to use the simulation itself as the underlying model. This leads to accurate and robust predictions under conditions relevant to CCS. In the second approach we use quantum-chemical calculations to produce ab initio evaluations of the interactions between CO2 and relevant impurities, taking N2 as an exemplar. We use a modest number of these calculations to train a machine-learning algorithm, known as a Gaussian process, to describe these data. The resulting model is then able to accurately predict a much broader set of ab initio force-field calculations at comparatively low numerical cost. Although our method is not yet ready to be implemented in a molecular simulation, we outline the necessary steps here. Such simulations have the potential to deliver first-principles simulation of the thermodynamic properties of impure CO2, without fitting to experimental data.

A molecular dynamics study on the liquid SbCl5and SbF5using force fields derived from quantum chemical calculations

2013 ◽  
Vol 51 (6) ◽  
pp. 695-703 ◽  
Author(s):  
Ali Morsali ◽  
Maryam Ghorbani ◽  
S. Ali Beyramabadi ◽  
Mohammad Reza Bozorgmehr ◽  
Mohammad Momen Heravi
Keyword(s):  
Molecular Dynamics ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Force Fields
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