NDLI: The Transport Properties of Sodium Atoms and the Heat Capacity of Sodium Dimers at High Temperatures

Content Provider	Springer Nature Link
Author	Biolsi, L. Holland, P. M.
Copyright Year	2010
Abstract	Including the contribution of excited state atoms can improve calculations of dilute gaseous transport properties at high temperatures. For sodium, experimental and/or theoretical information is available about the potential energy curves associated with each of ten low-lying states of the sodium dimer. These include the $${{\rm X}^{1}\Sigma_{\rm g}{}^{+}}$$ and $${^{3}\Sigma_{\rm u}{}{}^{+}}$$ states that dissociate to two ground state $^{2}$S sodium atoms and the four $${^{3}\Sigma_{\rm g,u}{}^{+},\,^{1}\Sigma _{\rm g,u}{}^{+},\,^{1}\Pi _{\rm g,u},\,^{3}\Pi _{\rm g,u}}$$ gerade/ungerade pairs of states that dissociate to a ground state $^{2}$S atom and an excited state $^{2}$P atom. Nine of these are bound states and have been fitted with the Hulburt–Hirschfelder potential, a very good general purpose atom–atom potential. The $^{3}$Π$_{g}$ state is not bound and has been fitted with the exponential repulsive potential. We have used these potentials to calculate viscosity collision integrals as a function of temperature, and employed degeneracy-weighted averaging to determine the viscosity and translational contribution to the thermal conductivity of the sodium atoms. These same potentials have been used to calculate the heat capacity, $${C_{p}^{\rm o}}$$ , of the sodium dimer using an approach that depends on the second virial coefficient and its first two temperature derivatives. Again, the inclusion of molecular states that dissociate to an excited state atom allows $${C_{p}^{\rm o}}$$ to be determined with improved accuracy at higher temperatures. Thus, thermophysical property calculations for sodium have been extended to 25,000 K. These results are compared with previous results, including heat capacities given in the NIST-JANAF Thermochemical Tables.
Starting Page	831
Ending Page	843
Page Count	13
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	31
Issue Number	4-5
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2010-04-21
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Heat capacity Sodium Thermal conductivity Viscosity Physical Chemistry Mechanics Condensed Matter Physics Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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