Kinetic approach to condensation: diatomic gases with dipolar molecules

Benilov, E. S.; Benilov, M. S.

Publication

Kinetic approach to condensation: diatomic gases with dipolar molecules

2017Journal article

dc.contributor.author	Benilov, E. S.
dc.contributor.author	Benilov, M. S.
dc.date.accessioned	2022-09-05T15:18:50Z
dc.date.available	2022-09-05T15:18:50Z
dc.date.issued	2017
dc.description.abstract	We derive a kinetic equation for rarefied diatomic gases whose molecules have a permanent dipole moment. Estimating typical parameters of such gases, we show that quantum effects cannot be neglected when describing the rotation of molecules, which we thus approximate by quantum rotators. The intermolecular potential is assumed to involve an unspecified short-range repulsive component and a long-range dipole-dipole Coulomb interaction. In the kinetic equation derived, the former and the latter give rise, respectively, to the collision integral and a self-consistent electric field generated collectively by the dipoles (as in the Vlasov model of plasma). It turns out that the characteristic period of the molecules’ rotation is much shorter than the time scale of the collective electric force and the latter is much shorter than the time scale of the collision integral, which allows us to average the kinetic equation over rotation. In the averaged model, collisions and interaction with the collective field affect only those rotational levels of the molecules that satisfy certain conditions of synchronism. It is then shown that the derived model does not describe condensation; i.e., permanent dipoles of molecules cannot exert the level of intermolecular attraction necessary for condensation. It is argued that an adequate model of condensation must include the temporary dipoles that molecules induce on each other during interaction, and that this model must be quantum, not classical.	pt_PT
dc.description.version	info:eu-repo/semantics/publishedVersion	pt_PT
dc.identifier.citation	Benilov, E. S., & Benilov, M. S. (2017). Kinetic approach to condensation: Diatomic gases with dipolar molecules. Physical Review E, 96(4), 042125. DOI: 10.1103/PhysRevE.96.042125	pt_PT
dc.identifier.doi	10.1103/PhysRevE.96.042125	pt_PT
dc.identifier.uri	http://hdl.handle.net/10400.13/4565
dc.language.iso	eng	pt_PT
dc.peerreviewed	yes	pt_PT
dc.publisher	American Physical Society	pt_PT
dc.relation	Institute for Plasmas and Nuclear Fusion
dc.relation.publisherversion	https://journals.aps.org/pre/abstract/10.1103/PhysRevE.96.042125	pt_PT
dc.rights.uri	http://creativecommons.org/licenses/by/4.0/	pt_PT
dc.subject	Diatomic gases	pt_PT
dc.subject	Dipolar molecules	pt_PT
dc.subject	Condensation	pt_PT
dc.subject	Kinetic approach	pt_PT
dc.subject	.	pt_PT
dc.subject	Faculdade de Ciências Exatas e da Engenharia	pt_PT
dc.title	Kinetic approach to condensation: diatomic gases with dipolar molecules	pt_PT
dc.type	journal article
dspace.entity.type	Publication
oaire.awardTitle	Institute for Plasmas and Nuclear Fusion
oaire.awardURI	info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FFIS%2F50010%2F2013/PT
oaire.citation.issue	4	pt_PT
oaire.citation.title	Physical Review E	pt_PT
oaire.citation.volume	96	pt_PT
oaire.fundingStream	6817 - DCRRNI ID
person.familyName	Benilov
person.givenName	Mikhail
person.identifier.ciencia-id	0F14-A79A-97C1
person.identifier.orcid	0000-0001-9059-1948
person.identifier.rid	K-4443-2015
person.identifier.scopus-author-id	7005138676
project.funder.identifier	http://doi.org/10.13039/501100001871
project.funder.name	Fundação para a Ciência e a Tecnologia
rcaap.rights	openAccess	pt_PT
rcaap.type	article	pt_PT
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