{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,7,30]],"date-time":"2025-07-30T11:08:02Z","timestamp":1753873682249,"version":"3.41.2"},"reference-count":41,"publisher":"AIP Publishing","issue":"3","funder":[{"DOI":"10.13039\/501100001824","name":"Czech Science Foundation","doi-asserted-by":"crossref","award":["Grant #15-19542S"],"award-info":[{"award-number":["Grant #15-19542S"]}],"id":[{"id":"10.13039\/501100001824","id-type":"DOI","asserted-by":"crossref"}]},{"name":"SHARCNET HPC Consortium"},{"DOI":"10.13039\/501100000038","name":"Natural Sciences and Engineering Research Council of Canada","doi-asserted-by":"publisher","award":["STPGP 479466-15"],"award-info":[{"award-number":["STPGP 479466-15"]}],"id":[{"id":"10.13039\/501100000038","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2017,7,21]]},"abstract":"<jats:p>The calculation of caloric properties such as heat capacity, Joule-Thomson coefficients, and the speed of sound by classical force-field-based molecular simulation methodology has received scant attention in the literature, particularly for systems composed of complex molecules whose force fields (FFs) are characterized by a combination of intramolecular and intermolecular terms. The calculation of a thermodynamic property for a system whose molecules are described by such a FF involves the calculation of the residual property prior to its addition to the corresponding ideal-gas property, the latter of which is separately calculated, either using thermochemical compilations or nowadays accurate quantum mechanical calculations. Although the simulation of a volumetric residual property proceeds by simply replacing the intermolecular FF in the rigid molecule case by the total (intramolecular plus intermolecular) FF, this is not the case for a caloric property. We describe the correct methodology required to perform such calculations and illustrate it in this paper for the case of the internal energy and the enthalpy and their corresponding molar heat capacities. We provide numerical results for cP, one of the most important caloric properties. We also consider approximations to the correct calculation procedure previously used in the literature and illustrate their consequences for the examples of the relatively simple molecule 2-propanol, CH3CH(OH)CH3, and for the more complex molecule monoethanolamine, HO(CH2)2NH2, an important fluid used in carbon capture.<\/jats:p>","DOI":"10.1063\/1.4993572","type":"journal-article","created":{"date-parts":[[2017,7,20]],"date-time":"2017-07-20T15:00:15Z","timestamp":1500562815000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":5,"title":["Molecular simulation of caloric properties of fluids modelled by force fields with intramolecular contributions: Application to heat capacities"],"prefix":"10.1063","volume":"147","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1982-2050","authenticated-orcid":false,"given":"William R.","family":"Smith","sequence":"first","affiliation":[{"name":"Department of Mathematics and Statistics, College of Physical and Engineering Science, University of Guelph 1 , Guelph, Ontario N1G 2W1, Canada"},{"name":"Faculty of Science, University of Ontario Institute of Technology 2 , Oshawa, Ontario L1H 7K4, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jan","family":"Jirs\u00e1k","sequence":"additional","affiliation":[{"name":"Institute of Chemical Process Fundamentals, Czech Academy of Sciences 3 , 165 02 Prague 6, Czech Republic and , 400 96 \u00dast\u00ed nad Labem, Czech Republic"},{"name":"Department of Chemistry, Faculty of Science, J. 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