Thermodynamics and Correlation Functions
of an Ultracold Nonideal Rydberg Plasma

M. Bonitz^a, B. B. Zelener^b,*, B. V. Zelener^b, É. A. Manykin^c,
V. S. Filinov^d, and V. E. Fortov^d

^aLehrstuhl Statistische Physik, Institut für Teoretische Physik und Astrophysik, Christian-Albrechts-Universität Kiel,
Kiel, D-24098 Germany

^bJoint Institute for High Temperatures, Russian Academy of Sciences, Moscow, 125412 Russia

^c Russian Research Centre Kurchatov Institute, Moscow, 123182 Russia

^dInstitute of Thermal Physics of Extreme States, Joint Institute for High Temperatures, Russian Academy of Sciences,
Moscow, 125412 Russia

*e-mail: bobozel@mail.ru

Received October 2, 2003

Abstract—A pseudopotential model is suggested to describe the thermodynamics and correlation functions of
an ultracold, strongly nonideal Rydberg plasma. The Monte Carlo method is used to determine the energy, pres-
sure, and correlation functions in the ranges of temperatures T = 0.1–10 K and densities n = 10^–2–10¹⁶ cm^–3.
For a weakly nonideal plasma, the results closely agree with the Debye asymptotic behavior. For a strongly non-
ideal plasma, many-particle clusters and a spatial order in the arrangement of plasma electrons and ions have
been found to be formed. © 2004 MAIK “Nauka/Interperiodica”.

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