Observation of Interference between Dielectronic Recombination and Radiative Recombination in Highly Charged Uranium Ions

1995 ◽  
Vol 74 (1) ◽  
pp. 54-57 ◽  
Author(s):  
D. A. Knapp ◽  
P. Beiersdorfer ◽  
M. H. Chen ◽  
J. H. Scofield ◽  
D. Schneider
Keyword(s):  
Radiative Recombination ◽  
Dielectronic Recombination ◽  
Uranium Ions

scholarly journals Ionization Equilibrium for Ions of Na, Al, P, Cl, A, K, Ca, Cr and Mn

1972 ◽  
Vol 14 ◽  
pp. 586-587 ◽  
Author(s):  
M. Landini ◽  
B.C. Monsignori Fossi
Keyword(s):  
Solar Atmosphere ◽  
Radiative Recombination ◽  
Dielectronic Recombination ◽  
Ionization Equilibrium ◽  
Collisional Ionization ◽  
Ionization Balance ◽  
Equilibrium Calculations

Ionization equilibrium calculations, which have a number of astrophysical applications, have been computed by Jordan for the ions of C, N, O, Ne, Mg, Si, S, Fe, and Ni.The aim of this paper is to extend the evaluation to other elements relevant to the investigation of the solar atmosphere. Ions of Na, Al, P, Cl, A, K, Ca, Cr, and Mn have been considered and the ionization balance has been computed for temperature from 104 to 107 K.The computation is performed including collisional ionization, autoionization, radiative recombination and dielectronic recombination.

scholarly journals Emission Lines of CI and N II in Planetary Nebulae

1989 ◽  
Vol 131 ◽  
pp. 225-225
Author(s):  
V. Escalante
Keyword(s):  
Radiative Recombination ◽  
Transition Probabilities ◽  
Potential Method ◽  
Dielectronic Recombination ◽  
Model Potential ◽  
Emission Lines ◽  
Published Data ◽  
Recombination Rates ◽  
Doubly Excited ◽  
Ngc 7027

A model potential method (Caves and Dalgarno, 1972, J. Quant. Spect. Rad. Transf., 12, 1539) was used to calculate accurate non-hydrogenic radiative recombination rates and transition probabilities of singly excited states of CI and N II. The results can be used to determine the excitation mechanism of emission lines and to estimate N III concentrations in nebulae with CI and N II emission lines. In most nebulae, observed permitted lines of N II are produced by radiative recombination, but sometimes stronger recombination lines are missing in their spectra. The [CI] lines observed in NGC 7027 cannot be explained by simple radiative and dielectronic recombination. The low [CI] λλ9850 + 23/ λ8727 value may indicate that the emission is produced in high density (NeZ 105 cm−3) condensations where partial collisional deexcitation of metastable levels, takes place. N III concentrations were determined using published data of NGC 3242, NGC 3918, and NGC 6572. The procedure outlined by Wilkes et al. (1981, M.N.R.A.S., 197, 1) to determine N abundances from (N+ + N++)/He+ ratios does not always give consistent results with UV or [N II] data. The problem may be due to errors in the calculation of transition probabilities involving the doubly excited levels 2s2p33P0 and 3D0 of N II that affect the branching and effective recombination rate of the multiplet N II λ5680.

scholarly journals Dielectronic recombination data for dynamic finite-density plasmas

2018 ◽  
Vol 610 ◽  
pp. A41 ◽  
Author(s):  
Jagjit Kaur ◽  
T. W. Gorczyca ◽  
N. R. Badnell
Keyword(s):  
Radiative Recombination ◽  
State Level ◽  
Dielectronic Recombination ◽  
Rate Coefficients ◽  
Atomic Data ◽  
Isoelectronic Sequence ◽  
Final State ◽  
Finite Density ◽  
Modelling Framework ◽  
Core Excitations

Context.We aim to present a comprehensive theoretical investigation of dielectronic recombination (DR) of the silicon-like isoelectronic sequence and provide DR and radiative recombination (RR) data that can be used within a generalized collisional-radiative modelling framework.Aims.Total and final-state level-resolved DR and RR rate coefficients for the ground and metastable initial levels of 16 ions between P+and Zn16+are determined.Methods.We carried out multi-configurational Breit-Pauli DR calculations for silicon-like ions in the independent processes, isolated resonance, distorted wave approximation. Both Δnc= 0 and Δnc= 1 core excitations are included usingLSand intermediate coupling schemes.Results.Results are presented for a selected number of ions and compared to all other existing theoretical and experimental data. The total dielectronic and radiative recombination rate coefficients for the ground state are presented in tabulated form for easy implementation into spectral modelling codes. These data can also be accessed from the Atomic Data and Analysis Structure (ADAS) OPEN-ADAS database. This work is a part of an assembly of a dielectronic recombination database for the modelling of dynamic finite-density plasmas.

scholarly journals Recombination Processes

1983 ◽  
Vol 103 ◽  
pp. 199-209 ◽  
Author(s):  
P. J. Storey
Keyword(s):  
Cross Sections ◽  
Radiative Recombination ◽  
Dielectronic Recombination ◽  
Ionization Threshold ◽  
Recombination Coefficient ◽  
Recombination Processes ◽  
Autoionizing States

The role of resonances in the photoionization cross-sections of ions is discussed in relation to the radiative recombination coefficient. The calculation of dielectronic contributions to the recombination coefficient is reviewed for nebular conditions, and the importance of autoionizing states close to the first ionization threshold is illustrated. For those ions for which dielectronic recombination is not important at nebular temperatures, an assessment of the accuracy of the best available recombination coefficients is given.

scholarly journals On Dielectronic Recombination

1970 ◽  
Vol 25 (12) ◽  
pp. 1781-1797 ◽  
Author(s):  
S.M.R. Ansari ◽  
G. Elwert ◽  
P. Mücklich
Keyword(s):  
General Formula ◽  
Radiative Recombination ◽  
Dielectronic Recombination ◽  
Tabular Form ◽  
Ionization Equilibrium ◽  
Temperature Range ◽  
Simplified Formula

Abstract The derivation of a general formula for the coefficient of dielectric recombination is reviewed, and approximate formulae known in the literature are discussed. With the aid of Burgess' simplified formula calculations of the coefficient of dielectronic recombination for the elements C, O , Ne, Mg, Si, S and Fe in the temperature range 108 - 4 x 106 °K are performed. The results are presented in figures and in tabular form. Taking into account dielectronic and radiative recombination, the ionization equilibrium for the various stages of these elements is determined and compared with recent results of other authors.

Radiative recombination of an electron with multiply charged uranium ions

2003 ◽  
Vol 95 (4) ◽  
pp. 537-545 ◽  
Author(s):  
M. B. Trzhaskovskaya ◽  
V. K. Nikulin
Keyword(s):  
Radiative Recombination ◽  
Multiply Charged ◽  
Uranium Ions
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