Collisional recombination in strongly coupled plasmas

Lankin, A. V.; Norman, G. É.

doi:10.1088/1751-8113/42/21/214042

Cited by 15 publications

(18 citation statements)

References 29 publications

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“…In contrast to the ionic plasma component, where such a pre-ordering leads to significant suppression of the heating due to the repulsive ionion interactions [92,93], the attractive electron-ion interaction is found to cause electron heating to Γ 0.5 irrespective of the initial state. This clearly excludes the existence of metastable, very strongly coupled twocomponent plasma states, in which recombination is suppressed by orders of magnitude, as has been suggested recently [63,64] on the basis of numerical simulations.…”

Section: Two-component Plasma Simulationssupporting

confidence: 77%

“…We further discuss simulations of two-component plasmas for various initial configurations and temperatures, that demonstrate strong disorder-induced electron heating to Γ ∼ 0.5. This conclusively excludes the possibility of a metastable plasma state with ordersof-magnitude suppression of recombination as suggested in [63,64]. Nevertheless, strong coupling effects on the recombination rate are found to have observable consequences during the short-time evolution of UCPs.…”

Section: Introductionsupporting

confidence: 76%

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Rydberg-atom formation in strongly correlated ultracold plasmas

Bannasch

Pohl

2011

Phys. Rev. A

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In plasmas at very low temperatures formation of neutral atoms is dominated by collisional three-body recombination, owing to the strong ∼ T −9/2 scaling of the corresponding recombination rate with the electron temperature T . While this law is well established at high temperatures, the unphysical divergence as T → 0 clearly suggest a breakdown in the low-temperature regime. Here, we present a combined molecular dynamics-Monte-Carlo study of electron-ion recombination over a wide range of temperatures and densities. Our results reproduce the known behavior of the recombination rate at high temperatures, but reveal significant deviations with decreasing temperature. We discuss the fate of the kinetic bottleneck and resolve the divergence-problem as the plasma enters the ultracold, strongly coupled domain.

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Section: Two-component Plasma Simulationssupporting

confidence: 77%

Section: Introductionsupporting

confidence: 76%

Rydberg-atom formation in strongly correlated ultracold plasmas

Bannasch

Pohl

2011

Phys. Rev. A

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“…To study the recombination process in NP the approach [48] is used. It is found that dependence of collision recombination rate on nonideality is not a monotonous one.…”

Section: Nonideality Effects: Rate Of Recombinationmentioning

confidence: 99%

Density and Nonideality Effects in Plasmas

Lankin

Norman

2009

Contrib. Plasma Phys.

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Self-consistent joint description of free and weakly bound electron states in plasmas is considered. Existence of two problems is emphasized: restriction of the number of atomic excited states and description of the smooth crossover from bound pair electron-ion excited states to collective excitations of free electrons. The spectrum domain intermediate between low-lying excited atoms and free electron continuous energy levels is studied. Density and nonideality effects are separated. The density effects are predominant for the shape of the curve of the energy spectrum near the ionization limit. It corresponds to the suppression of spectral lines in ideal multicharge plasma of warm dense matter. A suppression of collisional recombination turns out to be a nonideality effect. The suppression agrees with the measurements for ultracold plasmas and warm dense matter.

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“…On the other hand, it is written in the text of the article about the disagreement at large times, as should be expected from the physical formulation of the problem. 2 Some theoretical arguments regarding suppression of the recombination in ultracold plasmas can be found, for example, in paper [12] and references therein. Anyway, even if the recombination is taken into account by the standard way [11], its influence on the general law of temperature evolution is quite small.…”

Section: Analytical Estimatesmentioning

confidence: 99%

“…(1) to avoid large integration errors during the close collisions, the Coulomb's potential was cut off of smoothed out at the small distances (e.g. 1/r was changed to 1/(r + r 0 ) or something like that) [12,16,17];…”

Section: Formulation Of the Modelmentioning

confidence: 99%

Characteristic features of temperature evolution in ultracold plasmas

Dumin

2011

Plasma Phys. Rep.

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A theoretical interpretation of the recent experimental studies of temperature evolution in the course of time in the freely-expanding ultracold plasma bunches, released from a magneto-optical trap, is discussed. The most interesting result is finding the asymptotics of the form T e ∝ t −(1.2±0.1) instead of t −2 , which was expected for the rarefied monatomic gas during inertial expansion. As follows from our consideration, the substantially decelerated decay of the temperature can be well explained by the specific features of the equation of state for the ultracold plasmas with strong Coulomb's coupling, whereas a heat release due to inelastic processes (in particular, three-body recombination) does not play an appreciable role in the first approximation. This conclusion is confirmed both by approximate analytical estimates, based on the model of "virialization" of the chargedparticle energies, and by the results of ab initio numerical simulation. Moreover, the simulation shows that the above-mentioned law of temperature evolution is approached very quickly-when the virial criterion is satisfied only within a factor on the order of unity.

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Collisional recombination in strongly coupled plasmas

Cited by 15 publications

References 29 publications

Rydberg-atom formation in strongly correlated ultracold plasmas

Rydberg-atom formation in strongly correlated ultracold plasmas

Density and Nonideality Effects in Plasmas

Characteristic features of temperature evolution in ultracold plasmas

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