Observation of ion-ion correlation effects on emissivity and opacity of hot ultra-dense low Z plasmas

Leboucher-Dalimier, E.; Sauvan, P.; Angelo, P.; Poquérusse, A.; Schott, René; Dufour, E.; Mı́nguez, E.; Calisti, A.

doi:10.1016/s0022-4073(01)00092-9

Cited by 10 publications

(9 citation statements)

References 20 publications

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“…In the past few decades, extensive studies on the opacity of plasmas with temperatures of a few tenths of eV and densities of two orders less than solids have been done both experimentally and theoretically [3][4][5][6][7][8]. Only recently, however, have experiments been performed to investigate the properties of hot and solid-dense plasmas due to the technical advances in generating near or above solid-dense plasmas [9][10][11][12][13][14][15][16][17][18][19][20][21]. As for the theoretical methods, opacity of hot and dense plasmas has sufficient complexity to be reasonably 1 Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

“…Changes of the fine spectrally resolved radiative absorption structures and Rosseland and Planck mean opacities with density and temperature are investigated for a wide range of plasma conditions with a density of 0.2-20 g cm −3 and a temperature of 300-500 eV, respectively. Preliminary experimental results are available within this range of density and temperature [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Radiative opacities of hot and solid-dense aluminium plasmas using a detailed level accounting model

Hou

et al. 2009

J. Phys. B: At. Mol. Opt. Phys.

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An approach based on the self-consistent-field (SCF) multi-configuration Dirac–Fock (MCDF) model is developed to simulate radiative opacity of hot and solid-dense plasmas taking detailed levels into account. The correlation effects and the angular momentum coupling among the bound electrons are treated in the usual way employed in a normal MCDF method. Influences of plasma screening on transition energies, oscillator strengths and ionization potentials are included by introducing a correction to the one-electron potential to account for the screening of the ionized electrons. This correction depends on the detailed micro-space distribution of the ionized electrons in different ions. The total average number density of the ionized electrons in the plasma is obtained by solving the Saha equation with quantum degeneracy corrections. The ionized electron density distribution in each ion is described based on a Thomas–Fermi distribution in an atomic field. Since the electronic structure and the ionization balance depend on each other, the SCF procedure includes solving the MCDF and the Saha equations. As examples, calculations have been carried out to simulate the spectrally resolved radiative opacity and the Rosseland and Planck means of hot and solid-dense aluminium plasmas. Comparisons between the results of the present model, average atom model and experiments are made to show the significance of detailed line-by-line treatments on the calculated results.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Radiative opacities of hot and solid-dense aluminium plasmas using a detailed level accounting model

Hou

et al. 2009

J. Phys. B: At. Mol. Opt. Phys.

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“…The tail of the Holtsmark distribution is formed by single-ion close approaches [23]. Therefore, it is accurate to approximate In the integral (19) we also use P NN (r a) ≈ 3 r 2 a 3 and P θ (cos θ) = 1 2 . The last expression is generally true for ideal plasmas, since the directions of F NN and F spec are not correlated.…”

Section: Appendix Asymptotic Behaviour Of P α (η) In An Ideal Plasmamentioning

confidence: 99%

“…The last expression is generally true for ideal plasmas, since the directions of F NN and F spec are not correlated. The expression (19)…”

Section: Appendix Asymptotic Behaviour Of P α (η) In An Ideal Plasmamentioning

confidence: 99%

Plasma effect on tunnelling, charge transfer and transient quasimolecular states

Fisher¹

2003

J. Phys. B: At. Mol. Opt. Phys.

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The influence of a dense plasma environment on electron tunnelling between two ion potential wells in collectivized states and in charge-transfer collisions is studied. We show that the tunnelling probabilities in dilute plasma (in a close ion-ion collision) and in dense plasma differ strongly. The difference is due to the mixing between Stark components of donor-ion energy levels, caused by the field of spectator ions in a dense plasma. The mixing is determined by an angle α between the nearest-neighbour ion field and the total electric field acting on the donor ion. In close ion-ion binary collisions the mixing may be considered weak. However, for most plasma ions charge transfer, electron state collectivization and transient quasimolecule formation are strongly affected by the field of spectator ions. We derive approximate analytical expressions for the distribution function of α in an ideal plasma and perform molecular dynamics simulations to find the distribution function of α in both ideal and nonideal plasmas. Both α-dependent and average mixing coefficients are determined. We have found that the mixing is strong, even in ideal plasmas, and increases further with an increase in plasma nonideality. It is shown that there is no resonant charge transfer in dense plasmas. The applicability of a transient 'dicenter' quasimolecule model for dense plasmas is discussed.

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“…Notons qu'une forte densité peut rendre nécessaire d'introduire les inhomogénéités du champ [7], voire d'abandonner la notion d'un atome isolable pour considérer des quasi-molécules transitoires [8], mais nous n'envisageons ici que la distribution de probabilité du champ quasi statique baignant un atome supposé ponctuel.…”

Section: Introductionunclassified

Microchamp sur un traceur

Poquérusse¹

2007

Can. J. Phys.

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On simule des mélanges ioniques binaires par dynamique moléculaire classique, en traitant le champ électrique de haute fréquence dû aux électrons libres par un potentiel écranté, pour obtenir la distribution de probabilité du microchamp quasi statique sur les ions ou les neutres. Avec une précision absolue de 1 % du maximum, elle est représentée par une fraction rationnelle simple dont on donne les trois seuls paramètres dans un large domaine de charges et de concentrations.Abstract: Mixtures of two ionic species are simulated by classical molecular dynamics, where a screened potential accounts for the high frequency electric field from free electrons. With an absolute precision of 1% of the maximum, the resulting probability distribution of the quasi static microfield at ions or neutrals is characterized by a simple rational fraction involving only three parameters, which are given for a wide variety of charges and concentrations. Reçu le 27 avril 2006. Accepté le 21 décembre 2006. Publié sur le site Web des Presses scientifiques du CNRC, à http://rcp.cnrc.ca/, le 6 avril 2007.A. Poquérusse 1 . Laboratoire pour l'utilisation des lasers intenses (LULI),

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Observation of ion-ion correlation effects on emissivity and opacity of hot ultra-dense low Z plasmas

Cited by 10 publications

References 20 publications

Radiative opacities of hot and solid-dense aluminium plasmas using a detailed level accounting model

Radiative opacities of hot and solid-dense aluminium plasmas using a detailed level accounting model

Plasma effect on tunnelling, charge transfer and transient quasimolecular states

Microchamp sur un traceur

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