Effects of angular-momentum-changing electron collisions and radiative corrections on dielectronic satellite spectra

Jacobs, V. L.; Rogerson, J. E.; Chen, M. H.; Cowan, Robert D.

doi:10.1103/physreva.32.3382

Cited by 35 publications

(10 citation statements)

References 34 publications

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“…[18,19],but in its energy-averaged form. Likewise, ( cr;",) is the interference term of Jacobs, Cooper, and Haan which reduces to the usual independent-processes result in the limit of qf~(x).…”

Section: Theorymentioning

confidence: 99%

“…Most of these theoretical calculations to date have been for model problems. One notable exception is the study of interference effects on DR satellite intensities by Jacobs et al [18]; however, they only included part of the interference effect (see Sec. II).…”

Section: Introductionmentioning

confidence: 99%

“…Jacobs et al [18] studied the case for which the autoionization rate from a given level dominates the radiative rate out of that level. It turns out that a different term dominates the interference effect when the radiative rate dominates over the autoionization rate (see Sec.…”

Section: Introductionmentioning

confidence: 99%

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Unified dielectronic and radiative-recombination cross sections forU90+

Badnell

Pindzola

1992

Phys. Rev. A

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We have calculated unified photorecombination cross sections and independent-processes photorecombination cross sections for U + in the vicinity of the KLL resonances. For this case, where the radiative width of a level dominates the Auger width, we find relatively strong interference e6'ects between the direct (radiative) and indirect (dielectronic) recombination processes. In particular, we find that the unified photorecombination cross section for the 1s +e~1s 2s+hv line is suppressed by a factor of 2 in the presence of the 1s2s(1)2p( -') resonance. Overall, however, the KLL recombination cross section is reduced by only 2-3 %, at most.PACS number(s): 34.80.Kw

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Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Unified dielectronic and radiative-recombination cross sections forU90+

Badnell

Pindzola

1992

Phys. Rev. A

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“…In a low-density high-temperature plasma, such as a so-X+' '(i)+e (p)~X+' "(a), (2) lar Gare or a tokamak discharge, multiply charged atomic ions tend to recombine predominantly by the two-step dielectronic recombination process. Dielectronic recombination was first described by Bates and Massey in 1943 in connection with low-temperature phenomena.…”

Section: Introductionmentioning

confidence: 99%

“…The accompaniment of the radiationless capture process by the excitation of the recombining ion is necessary for total energy conservation. Recombination is accomplished if, instead of autoionizing by means of the inverse of the capture process (2), the doubly excited state I a ) undergoes a radiatively stabilizing transition to a bound final state X+' ')(a) X+( ' (f)+fik .…”

Section: Introductionmentioning

confidence: 99%

Unified description of radiative and dielectronic recombination, including the coupling between autoionization and radiation continua

Cooper

1987

Phys. Rev. A

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Although dielectronic and radiative recombination are usually treated as distinct noninterfering processes, Alber, Cooper, and Rau [Phys. Rev. A 30, 2845 (1984)] have recently presented a scattering-or S-matrix analysis which provides a unified description of these processes. This description employs a diagonalization of the atom plus radiation field Hamiltonian using a limited basis set consisting of one discrete autoionizing state, a single-electron continuum, and a single-photon continuum. In the present work we extend M&lier scattering operator and resolvent operator techniques, which have previously been used to discuss the decay of prepared systems, in order to provide an Smatrix analysis of the electron-ion photorecombination process near an isolated autoionizing resonance. We explicitly allow for degenerate magnetic sublevels of the atomic system and for multiple angular momentum contributions in the partial-wave expansion of the electron-continuum eigenstate. After the introduction of the pole approximation, in which only the 6-function term is retained in the evaluation of the various self-energies that occur in the diagonalization of the Hamiltonian for the combined many-electron radiation-field system, we obtain the total electron-ion photorecornbination cross section as the sum of the radiative and dielectronic recombination contributions together with the conventionally ignored interference term. The radiative and dielectronic recombination cross sections reduce to the familiar forms when the continuum-continuum coupling eftects are neglected. Alternatively, the combined cross section for the entire electron-ion photorecombination process may be represented by a modified Fano line profile, which is shifted and broadened as a result of the coupling between the autoionization and radiation continua. Recombination processes that involve more than a single state of the initial ion, of the autoionizing resonance, or of the final system can be treated by appropriately augmenting the unperturbed basis set. It is anticipated that the eft'ects of the interference between radiative and dielectronic recombination and of the continuum-continuum coupling will be most important for individual transitions involving low-lying autoionizing levels and will probably be negligible for the total dielectronic recombination rates due to the highly excited levels.

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Density effects on the spectral intensities of dielectronic satellite line in dense plasmas

Banon

Bernabéu

1988

Il Nuovo Cimento D

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Effects of angular-momentum-changing electron collisions and radiative corrections on dielectronic satellite spectra

Cited by 35 publications

References 34 publications

Unified dielectronic and radiative-recombination cross sections forU90+

Unified dielectronic and radiative-recombination cross sections forU90+

Unified description of radiative and dielectronic recombination, including the coupling between autoionization and radiation continua

Density effects on the spectral intensities of dielectronic satellite line in dense plasmas

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