Photoionization of the barium<i>4d</i>subshell including relativistic and relaxation effects

Radojević, V.; Kutzner, Mickey; Kelly, Hugh P.

doi:10.1103/physreva.40.727

Cited by 55 publications

(51 citation statements)

References 18 publications

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“…Subsequently the relaxation efI'ect has been studied by the multichannel multiconfiguration Dirac-Fock method (MMCDF) [12,13], RPA [14], and many-body perturbation theory (MBPT) [15].…”

Section: Theory Of Relaxation Effectmentioning

confidence: 99%

Combined effect of relaxation and channel interaction on outer-shell photoionization in Ar,K+, andCa2
Tulkki
¹

1993
Phys. Rev. A
10
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The in8uence of relaxation and final-state channel interaction on 3p and 3s photoionization of Ar, K+, and Ca + has been studied by multiconfiguration multichannel Dirac-Fock method. The total relaxation effect was separated into reduction of the ionization energy and into an energydependent modification of the photoionization cross section. For 3p subshell the relaxation reduced the cross section at their maxima, near threshold, by 10 -20 '70 and vanished about 100 -140 eV above threshold.The relaxation decreased the Ar 3s cross section whereas the Ca + 3s cross section is enhanced slightly even at large photon energies. The relaxation effect decreases rather slowly with the increasing ionic charge. Our results indicate that the relaxation is nonadditive and of comparable importance with other leading many-electron effects. This emphasizes the necessity of a unified treatment of static and dynamic correlation effects. PACS number(s): 32.80.Fb

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“…Subsequently the relaxation efI'ect has been studied by the multichannel multiconfiguration Dirac-Fock method (MMCDF) [12,13], RPA [14], and many-body perturbation theory (MBPT) [15].…”

Section: Theory Of Relaxation Effectmentioning

confidence: 99%

Combined effect of relaxation and channel interaction on outer-shell photoionization in Ar,K+, andCa2
Tulkki
¹

1993
Phys. Rev. A
10
0
6
0
View full text Add to dashboard Cite

show abstract

“…These methods include close coupling [6], R-matrix [7], K-matrix L 2 [8], nonrelativistic random-phase approximation (RPA) [often called RPA with exchange (RPAE)] [9], relativistic random-phase approximation (RRPA) [10], the RRPA with relaxation (RRPA-R) [11], many-body perturbation methods [12], the multiconfiguration Hartree-Fock (MCHF) technique [13], and its relativistic counterpart, the multiconfiguration Dirac-Fock (MCDF) technique [14], among others. The RRPA has been applied earlier to study dipole photodetachment of halogen negative ions [15], and this work was recently extended to investigate interchannel coupling effects on nondipole photodetachment parameters of Cl − [16].…”

Section: Introductionmentioning

confidence: 99%

Valence photodetachment of Li−and Na−using relativistic many-body techniques

Jose¹,

Pradhan²,

Radojević³

et al. 2011

Phys. Rev. A

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The multiconfiguration Tamm-Dancoff technique (MCTD) is applied to study photodetachment of negative ions of lithium and sodium. A cusplike structure is found in the photodetachment cross section just below the first detachment-plus-excitation threshold of Li − (Li 2p), and of Na − (Na 3p), in qualitative agreement with existing theoretical and experimental results. The current work emphasizes the importance of correlation in the form of configuration interaction in the photodetachment process and demonstrates the utility of MCTD in dealing with highly correlated systems.

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“…Recently the effect of relaxation on innerand valenceshell photoionization has been studied using the full many-electron approach by multichannel multiconfiguration Dirac-Fock (MMCDF) [4], and in a somewhat lower approximation using many-body perturbation theory [5] and the random-phase approximation [6]. These calculations predicted for inner shells that near-threshold relaxation results in photon-energy-dependent reduction of cross sections.…”

Section: Introductionmentioning

confidence: 99%

Subshell-dependent relaxation in the Auger effect

Tulkki

Mäntykenttä

1993

Phys. Rev. A

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The effect of relaxation on KLL, LMM, and MNN Auger-electron spectra of Ne, Mg, Ar, Ca, Zn, and Kr has been studied by the Dirac-Fock method. The relaxation is shown to depend universally on the Auger-electron energy aud on the number of peel electrons (N") in subshells above the final-state holes. In the sudden approx-imation limit (large N") the relaxation saturates to 14%%uo reduction of the Auger rates in analogy to the 20'Fo reduction of deep inner-shell Dirac-Fock photoionization cross sections well above threshold. The isotropy of the relaxation is emphasized by its small influence on the angular distribution of Auger electrons. PACS number(s): 32.80.Hd, 32.80.Fb

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Photoionization of the barium4dsubshell including relativistic and relaxation effects

Cited by 55 publications

References 18 publications

Combined effect of relaxation and channel interaction on outer-shell photoionization in Ar,K+, andCa2
Tulkki
¹

1993
Phys. Rev. A
10
0
6
0
View full text Add to dashboard Cite

Combined effect of relaxation and channel interaction on outer-shell photoionization in Ar,K+, andCa2
Tulkki
¹

1993
Phys. Rev. A
10
0
6
0
View full text Add to dashboard Cite

Valence photodetachment of Li−and Na−using relativistic many-body techniques

Subshell-dependent relaxation in the Auger effect

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Photoionization of the barium4dsubshell including relativistic and relaxation effects

Cited by 55 publications

References 18 publications

Combined effect of relaxation and channel interaction on outer-shell photoionization in Ar,K+, andCa2Tulkki1 1993Phys. Rev. A10060View full textAdd to dashboardCite

Combined effect of relaxation and channel interaction on outer-shell photoionization in Ar,K+, andCa2Tulkki1 1993Phys. Rev. A10060View full textAdd to dashboardCite

Valence photodetachment of Li−and Na−using relativistic many-body techniques

Subshell-dependent relaxation in the Auger effect

Contact Info

Product

Resources

About

Combined effect of relaxation and channel interaction on outer-shell photoionization in Ar,K+, andCa2
Tulkki
¹

1993
Phys. Rev. A
10
0
6
0
View full text Add to dashboard Cite

Combined effect of relaxation and channel interaction on outer-shell photoionization in Ar,K+, andCa2
Tulkki
¹

1993
Phys. Rev. A
10
0
6
0
View full text Add to dashboard Cite