Collisional radiative model for Ar-O2 mixture plasma with fully relativistic fine structure cross sections

We describe a package of programs for the implementation of the collisional-radiative model to complex configurations. The number of levels taken into account may be several hundreds. The heart of the package is a very efficient program for excitation cross sections in the Distorted Wave framework, using the Relativistic Parametric Potential wave functions. The basic jj coupling scheme actually simplified the computations, enabling a useful factorization into radial and angular parts. Intermediate coupling and configuration interactions are accounted for. We computed ratios of intensities of 3d9 − 3d84s (E2) to 3d9 −3d84p (El) transitions as functions of ne and Te in Xe XXVIII and other Co-like spectra. The atomic model involves all the levels of configurations (3p6)3d9; −3d84s, −3d84p, −3d84d, −3d84f, and (3p5) −3d10, −3d94p. (275 levels) and all the transitions between them. Results compare very well with experimental spectra from TFR.

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Application of Molecular Convergent Close-Coupling cross sections in a Collisional Radiative model for the triplet system of molecular hydrogen

Journal of Physics D Applied Physics ◽

10.1088/1361-6463/abccf2 ◽

2020 ◽

Author(s):

Dirk Wünderlich ◽

Liam Hall Scarlett ◽

Stefan Briefi ◽

Ursel Fantz ◽

Mark Christian Zammit ◽

...

Keyword(s):

Cross Sections ◽

Molecular Hydrogen ◽

Close Coupling ◽

Collisional Radiative Model ◽

Radiative Model

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Non L.T.E. Properties of Quasistationary Oxygen Plasmas

Zeitschrift für Naturforschung A ◽

10.1515/zna-1976-3-423 ◽

1976 ◽

Vol 31 (3-4) ◽

pp. 362-368 ◽

Cited By ~ 9

Author(s):

M. Cacciatore ◽

M. Capitelli

Keyword(s):

Excited States ◽

Cross Sections ◽

Ground State ◽

Radiative Recombination ◽

Local Thermodynamic Equilibrium ◽

Collisional Radiative Model ◽

Radiative Model ◽

Ionization Coefficients ◽

Selection Of ◽

The Continuum

The non L.T.E. (local thermodynamic equilibrium) properties of optically thin and thick quasistationary oxygen plasmas have been calculated for the temperature range k T = 0.5 - 1.5 eV and for the electron density interval 108 - 1016 cm-3 , by using the collisional-radiative model of Bates, Kingston and McWhirther. The results include1 the coefficients r0(i) and r1(i), which represent the contribution to the population density of the ith quantum level from the continuum and from the ground state, respectively2 the values of α and S, which are the collisional-radiative recombination and ionization coefficients, respectively. The accuracy of the present results is discussed in connection with the adopted plasma model and with the selection of the collisional cross sections for forbidden and allowed transitions. A discussion is also presented of the influence of the two low lying excited states of oxygen atoms (i.e. the states 2p41D, 2p41S) on the non L.T.E. properties of these plasmas. A satisfactory agreement is found with the calculations of Julienne et al. and with the experimental results of Jones.

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