Effects of channel interaction, exchange, and relaxation on the angular distribution and spin polarization of Auger electrons from noble-gas atoms

Tulkki, Jukka; Kabachnik, N. M.; Aksela, H.

doi:10.1103/physreva.48.1277

Cited by 102 publications

(149 citation statements)

References 45 publications

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“…Lagrangian multipliers were used to obtain orthogonality with bound orbitals and the j javerage exchange interaction between the Auger electron and the residual ion was fully taken into account. The details of the numerical procedure used in the MCDF code has been described recently by Tulkki et al [10,24].…”

Section: Of Overlapping Statesmentioning

confidence: 99%

“…One can expect that for Auger satellites these correlation effects are even more prominent [15]. This has prompted us to make a more accurate analysis of the angular distribution of satellite Auger electrons by using the multiconfiguration Dirac-Fock (MCDF) method which has provided an adequate description of the anisotropy of normal and resonant Auger transitions [10,13,14] Ne.…”

Section: Introductionmentioning

confidence: 99%

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Coherence and correlation in the anisotropy of NeKL-LLLsatellite Auger decay

et al. 1994

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The energies, intensities, and angular anisotropies of the Ne KL-LLL satellite Auger lines have been studied by the multiconfiguration Dirac-Fock method. In addition to the initialand finalstate correlation eHects, we have studied the inBuence of the quantum beat efFect on this Auger spectrum. Since the energy splitting of the Ne 1s 2p P multiplet is much smaller than the lifetime broadening, the coherent excitation of these initial states by the in time and space localized electromagnetic pulse of the projectile has a drastic efFect on the angular distribution of Auger electrons. To analyze this coherence eKect we have generalized the theory of the angular distribution of Auger electrons to the case of coherent excitation of partially overlapping initial states. The results of our calculations are in good overall agreement with experiment. However, for a quantitative study of the in6uence of the coherence and the initial spin state on the anisotropy of these Auger lines new measurements with lower error limits are necessary.PACS number(s): 32.80.Hd, 32.80.Fb

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Section: Of Overlapping Statesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coherence and correlation in the anisotropy of NeKL-LLLsatellite Auger decay

et al. 1994

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“…The angular distribution of a normal or resonant Auger transition for either unpolarized or linearly polarized incoming photons is given by [5,16] where R', f is the angle integrated rate for an Auger transition from initial state i to final state f Here i and. f stand for a complete set of quantum numbers needed to specify the pertinent atomic (ionic) states [5].…”

Section: Theorymentioning

confidence: 99%

Influence of the initial- and final-state configuration interaction on the anisotropy of the resonant Auger decay of Kr 3d−15pand Xe 4
Tulkki
¹
,
Aksela
²
,
Kabachnik
³

1994
Phys. Rev. A
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47
8
32
1
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The anisotropy of the resonant Auger decay of photon-excited Kr 3d~i'~5~5p and Xe 4d3/Q 5i$6p states has been studied by the multiconfiguration Dirac-Fock method. The calculations account for the configuration interaction both in the initial and in the 6nal states of the Auger decay. For the nonresolved nd (n+ 2)p (J = 1) resonances (n = 3 for Kr, and n = 4 for Xe) the average intensities and the anisotropies of the Auger lines were calculated by weighing each partial rate by the pertinent Dirac-Fock photoexcitation probabilities. Our results show that, in addition to the initialand Gnal-state correlation, both the relaxation and the exchange interaction have a substantial effect on the anisotropy of these Auger spectra. For most Auger lines there is good agreement between our calculated P parameters and experimental values for the Kr and Xe nd i (n+ 2)p photoexcitation resonances; there is also satisfactory agreement for the Kr 3d~i'~5p and Xe 4d~i~6p resonant Auger spectra. However, the remaining notable discrepancies between theory and experiment indicate that important correlation effects are still omitted in our calculations. Discrepancies between difFerent experimental results stress the need for further improvements on the experimental side.PACS number(s): 32.80.Hd, 32.80.Fb

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“…These theories cannot describe the anisotropy of the Auger emission quantitatively [11,14,34]. More sophisticated descriptions account for spin-orbit interactions, and the fact that the widths of the individual initial double-vacancy states are often comparable or larger than their energy splitting ͑⌫ജ͒ [35][36][37][38][39][40]. Later, Kabachnik and his co-workers [9] applied the relativistic MCDF method to treat the anisotropy of Auger emission from overlapping states.…”

Section: B Angular Anisotropy Coefficientsmentioning

confidence: 99%

Experimental study of coherence and correlation in the anisotropy of NeKL-LLLsatellite Auger decay

et al. 2004

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The coherent excitation of overlapping atomic states by ion projectiles has a strong effect on the angular distribution of Auger electrons. Therefore, the measurement of the angular anisotropy of outgoing Auger electrons is suitable for the quantitative studies of the influence of the coherence. In our experiment the Ne target was bombarded with 700-2000 keV H + and 2000 keV He + projectiles. The angular distributions of KL 2,3 -LLL 2,3 Auger electrons emitted from the decay of the coherently excited 1s2p doubly vacancy states of Ne were measured. The anisotropy parameter of the Auger decay was deduced from the measurements and compared with theoretical results calculated using the multiconfiguration Dirac-Fock method. The results indicate that one should go beyond the LS coupling scheme even at this relatively low atomic number element, but also suggest that only partially overlapping states need to be taken into account.

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Effects of channel interaction, exchange, and relaxation on the angular distribution and spin polarization of Auger electrons from noble-gas atoms

Cited by 102 publications

References 45 publications

Coherence and correlation in the anisotropy of NeKL-LLLsatellite Auger decay

Coherence and correlation in the anisotropy of NeKL-LLLsatellite Auger decay

Influence of the initial- and final-state configuration interaction on the anisotropy of the resonant Auger decay of Kr 3d−15pand Xe 4
Tulkki
¹
,
Aksela
²
,
Kabachnik
³

1994
Phys. Rev. A
Self Cite
47
8
32
1
View full text Add to dashboard Cite

Experimental study of coherence and correlation in the anisotropy of NeKL-LLLsatellite Auger decay

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Effects of channel interaction, exchange, and relaxation on the angular distribution and spin polarization of Auger electrons from noble-gas atoms

Cited by 102 publications

References 45 publications

Coherence and correlation in the anisotropy of NeKL-LLLsatellite Auger decay

Coherence and correlation in the anisotropy of NeKL-LLLsatellite Auger decay

Influence of the initial- and final-state configuration interaction on the anisotropy of the resonant Auger decay of Kr 3d−15pand Xe 4Tulkki1, Aksela2, Kabachnik3 1994Phys. Rev. ASelf Cite478321View full textAdd to dashboardCite

Experimental study of coherence and correlation in the anisotropy of NeKL-LLLsatellite Auger decay

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Influence of the initial- and final-state configuration interaction on the anisotropy of the resonant Auger decay of Kr 3d−15pand Xe 4
Tulkki
¹
,
Aksela
²
,
Kabachnik
³

1994
Phys. Rev. A
Self Cite
47
8
32
1
View full text Add to dashboard Cite