TY - JOUR
T1 - The leading correction to the Thomas–Fermi model at finite temperature
AU - Segev, Eyal
AU - Gazit, Doron
N1 - Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2019/3/15
Y1 - 2019/3/15
N2 - The semi-classical approach leading to the Thomas–Fermi (TF) model provides a simple universal thermodynamic description of the electronic cloud surrounding the nucleus in an atom. This model is known to be exact at the limit of Z→∞ i.e., infinite nuclear charge, at finite density and temperature. Motivated by the zero-temperature case, we show in the current paper that the correction to TF due to quantum treatment of the strongly bound inner-most electrons, for which the semi-classical approximation breaks, scales as Z−1∕3, with respect to the TF solution. As such, it is more dominant than the quantum corrections to the kinetic energy, as well as exchange and correlation, which are known to be suppressed by Z−2∕3. We conjecture that this is the leading correction for this model. In addition, we present a different free energy functional for the TF model, and a successive functional that includes the strongly bound electrons correction. We use this corrected functional to derive a self-consistent potential and the electron density in the atom, and to calculate the corrected energy. At this stage, our model has a built-in validity limit, breaking as the L shell ionizes.
AB - The semi-classical approach leading to the Thomas–Fermi (TF) model provides a simple universal thermodynamic description of the electronic cloud surrounding the nucleus in an atom. This model is known to be exact at the limit of Z→∞ i.e., infinite nuclear charge, at finite density and temperature. Motivated by the zero-temperature case, we show in the current paper that the correction to TF due to quantum treatment of the strongly bound inner-most electrons, for which the semi-classical approximation breaks, scales as Z−1∕3, with respect to the TF solution. As such, it is more dominant than the quantum corrections to the kinetic energy, as well as exchange and correlation, which are known to be suppressed by Z−2∕3. We conjecture that this is the leading correction for this model. In addition, we present a different free energy functional for the TF model, and a successive functional that includes the strongly bound electrons correction. We use this corrected functional to derive a self-consistent potential and the electron density in the atom, and to calculate the corrected energy. At this stage, our model has a built-in validity limit, breaking as the L shell ionizes.
KW - Finite temperature
KW - Plasma
KW - Thomas–Fermi model
UR - http://www.scopus.com/inward/record.url?scp=85058018258&partnerID=8YFLogxK
U2 - 10.1016/j.physa.2018.11.010
DO - 10.1016/j.physa.2018.11.010
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AN - SCOPUS:85058018258
SN - 0378-4371
VL - 518
SP - 158
EP - 168
JO - Physica A: Statistical Mechanics and its Applications
JF - Physica A: Statistical Mechanics and its Applications
ER -