scholarly journals Temperature Relaxation in Strongly-Coupled Binary Ionic Mixtures

2021 ◽  
Author(s):  
Luciano G. Silvestri ◽  
Michael S. Murillo ◽  
R. Tucker Sprenkle ◽  
Scott D. Bergeson
Keyword(s):  
Strongly Coupled ◽  
Temperature Relaxation ◽  
Ionic Mixtures

Temperature relaxation in strongly-coupled binary ionic mixtures

2021 ◽  
Author(s):  
Robert Sprenkle ◽  
Luciano Silvestri ◽  
M. S. Murillo ◽  
Scott Bergeson
Keyword(s):  
Material Properties ◽  
Inertial Confinement Fusion ◽  
Coulomb Systems ◽  
High Energy ◽  
High Energy Density ◽  
Inertial Confinement ◽  
Relaxation Rates ◽  
Strongly Coupled ◽  
Wide Range ◽  
Temperature Relaxation

Abstract New facilities such as the National Ignition Facility and the Linac Coherent Light Source have pushed the frontiers of high energy-density matter. These facilities offer unprecedented opportunities for exploring extreme states of matter, ranging from cryogenic solid-state systems to hot, dense plasmas, with applications to inertial-confinement fusion and astrophysics. However, significant gaps in our understanding of material properties in these rapidly evolving systems still persist. In particular, non-equilibrium transport properties of strongly-coupled Coulomb systems remain an open question. Here, we study ion-ion temperature relaxation in a binary mixture, exploiting a recently-developed dual-species ultracold neutral plasma. We compare measured relaxation rates with atomistic simulations and a range of popular theories. Our work validates the assumptions and capabilities of the simulations and invalidates theoretical models in this regime. This work illustrates an approach for precision determinations of detailed material properties in Coulomb mixtures across a wide range of conditions.

Theory of Tunneling Assisted Electron Spin–Lattice Relaxation

1971 ◽  
Vol 49 (12) ◽  
pp. 1620-1629 ◽  
Author(s):  
K. P. Lee ◽  
D. Walsh
Keyword(s):  
Lattice Relaxation ◽  
Zeeman Splitting ◽  
Spin Lattice Relaxation ◽  
Phonon Coupling ◽  
Orbital State ◽  
Strongly Coupled ◽  
Practical Applications ◽  
Spin Lattice ◽  
Jahn Teller ◽  
Temperature Relaxation

It is shown for an Eg orbital state and a tunneling splitting which is small compared with the Zeeman splitting that a strong Jahn–Teller coupling can lead to an enhancement of the direct spin–phonon coupling by several orders of magnitude. By comparing the theory with low temperature relaxation measurements on Cu2+ in a double nitrate the magnitude of several of the significant parameters associated with the Jahn–Teller problem is derived. A T2g orbital state strongly coupled to t2g modes of vibration can also have a strong spin–phonon coupling; the corresponding situation is briefly discussed.The strong coupling of the vibronic states to the lattice and the considerable range in the strength of this coupling have a number of practical applications.

scholarly journals Nonideality effects on temperature relaxation

2002 ◽  
Vol 20 (4) ◽  
pp. 543-545 ◽  
Author(s):  
D.O. GERICKE ◽  
M.S. MURILLO ◽  
M. SCHLANGES
Keyword(s):  
Ad Hoc ◽  
Relaxation Rates ◽  
Strong Electron ◽  
Strongly Coupled ◽  
Transfer Rates ◽  
Temperature Relaxation ◽  
Temperature Electron ◽  
Coupled Plasmas ◽  
Two Temperature ◽  
Good Agreement

The relaxation of two-temperature electron–ion systems is investigated. We apply a quantum kinetic approach which is suitable to treat strong electron–ion coupling and avoids any ad hoc cut-off procedures. A comparison with the usual Landau–Spitzer formula gives good agreement for Coulomb logarithms larger than three, whereas larger relaxation rates were found for strongly coupled plasmas. It is shown that the Landau–Spitzer theory can be greatly improved considering hyperbolic orbits. Numerical results for the energy transfer rates and the temporal behavior of the electron temperature are shown.

scholarly journals Linear and electronic transport in strongly coupled binary ionic mixtures

1990 ◽  
Vol 8 (4) ◽  
pp. 781-791
Author(s):  
D. Léger ◽  
C. Deutsch
Keyword(s):  
High Temperature ◽  
Transport Properties ◽  
Electronic Transport ◽  
Systematic Investigation ◽  
Coulomb Interactions ◽  
Strongly Coupled ◽  
Linear Transport ◽  
Basic Formalism ◽  
Ionic Mixtures

This paper is devoted to a systematic investigation of linear transport properties in strongly coupled binary ionic mixtures of pointlike ions interacting solely through Coulomb interactions. The basic formalism rests upon suitable extensions of the Boltzmann–Ziman equation explained in this work. Validity conditions for the Lorentzian approximation are thoroughly discussed as well as entropy arguments. High temperature inelastic contributions are emphasized out.

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