title: Rotational energy relaxation time of vibrationally excited molecules
metadata.name: dc.contributor.author
metadata.value: Bechina, Anna I.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Kustova, Elena V.
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2019-05-24T09:28:30Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2019-05-24T09:28:30Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2019-03
metadata.lang: -
metadata.name: dc.identifier.citation
metadata.value: Bechina A. I., Kustova E.V. Rotational energy relaxation time of vibrationally excited molecules. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2019, vol. 6 (64), issue 1, pp. 118–130.
metadata.lang: en_GB
metadata.name: dc.identifier.other
metadata.value: https://doi.org/10.21638/11701/spbu01.2019.109
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/15542
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: The inﬂuence of the molecular vibrational state on the rotational energy relaxation time is studied in the state-to-state approach. The rotational levels of the molecules are described by the nonrigid rotator model; their interaction is described by the variable soft sphere model. According to this model, collision cross sections for N2-N, O2 -O, NO-O interactions are calculated for diﬀerent vibrational and rotational levels of molecules. On the basisof the kinetic theory of nonequilibrium processes, the rotational relaxation time is introduced for each vibrational level. Relaxation times are calculated numerically in the wide temperature range, and a comparison with the relaxation time obtained by the well-known Parker formula is carried out. The inﬂuence of various multiquantum rotational transitions on the accuracy of the calculation of the rotational relaxation time is analyzed; the convergence of the solution is shown with increasing the maximum possible number of quanta transferred during the transition. It is shown that the vibrational state of the molecule signiﬁcantly aﬀects the rotational energy relaxation time in the state-to-state approach; when calculating the state-speciﬁc transport coeﬃcients, the use of the Parker formula can lead to a noticeable error. In the one-temperature approximation for moderate temperatures, the Parker formula provides a satisfactory agreement with the results obtained by averaging the state-resolved relaxation times with the Boltzmann distribution over vibrational energy.
metadata.lang: en_GB
metadata.name: dc.description.sponsorship
metadata.value: Работа выполнена при поддержке СПбГУ (тема НИР 6.37.206.2016) и РФФИ (грант № 18-01- 00493).
metadata.lang: en_GB
metadata.name: dc.language.iso
metadata.value: ru
metadata.lang: en_GB
metadata.name: dc.publisher
metadata.value: St Petersburg State University
metadata.lang: en_GB
metadata.name: dc.relation.ispartofseries
metadata.value: Vestnik of St Petersburg University. Mathematics. Mechanics. Astronomy;Volume 6 (64); Issue 1
metadata.lang: -
metadata.name: dc.subject
metadata.value: relaxation time
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: rotational energy
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: vibrationally excited state
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: state-to-state approach
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Rotational energy relaxation time of vibrationally excited molecules
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: 118-130.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/15542/1/118-130.pdf
resources.format: Adobe PDF
resources.size: 571,51 kB