Gordon decomposition of the magnetizability of a Dirac one-electron atom in an arbitrary discrete energy state

• URL: http://arxiv.org/abs/2006.03892v2
• Date: Wed, 11 Dec 2024 09:57:54 GMT
• Title: Gordon decomposition of the magnetizability of a Dirac one-electron atom in an arbitrary discrete energy state
• Authors: Patrycja Stefańska,
• Abstract summary: This work is a prequel to our recent article, where the numerical values of $chi_d$ and $chi_p$ were obtained for some excited states of selected hydrogenlike ions with $1 leqslant Z leqslant 137$.
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• Abstract: We present a Gordon decomposition of the magnetizability of a Dirac one-electron atom in an arbitrary discrete energy eigenstate, with a pointlike, spinless, and motionless nucleus of charge $Ze$. The external magnetic field, by which the atomic state is perturbed, is assumed to be weak, static, and uniform. Using the Sturmian expansion of the generalized Dirac--Coulomb Green function proposed by Szmytkowski in 1997, we derive a closed-form expressions for the diamagnetic ($\chi_{d}$) and paramagnetic ($\chi_{p}$) contributions to $\chi$. Our calculations are purely analytical; the received formula for $\chi_{p}$ contains the generalized hypergeometric functions ${}_3F_2$ of the unit argument, while $\chi_{d}$ is of an elementary form. For the atomic ground state, both results reduce to the formulas obtained earlier by other author. This work is a prequel to our recent article, where the numerical values of $\chi_{d}$ and $\chi_{p}$ for some excited states of selected hydrogenlike ions with $1 \leqslant Z \leqslant 137$ were obtained with the use of the general formulas derived here.

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