Relativistic-intermediate-coupling calculations of angular distributions in resonant Auger decay

Chen, M.H.

doi:10.1103/physreva.47.3733

Cited by 39 publications

(41 citation statements)

References 19 publications

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“…In this case expression (12) coincides with the usual one for an isolated excited state [22]. Analyzing experimental angular distributions, it is convenient to use transitions from a singlet state in order to obtain the experimental value of the alignment parameter AI, o(L, L) which may be used further in the analysis of the angular anisotropy of triplet states.…”

Section: Of Overlapping Statesmentioning

confidence: 93%

“…(12) are factorized into parts determined by the excitation and decay processes. However, the physical meaning of the parameters is not the same as in the case of an isolated level [22].…”

Section: Of Overlapping Statesmentioning

confidence: 99%

“…29(1) 785.86 (2) Ref. [6] 730.95 (8) 751.46 (8) 754.48 (12) 759.66 (12) 768.32 (12) 783.45 (8) 14.3(5) 6.s(2) 16.4(S) 43.0(4) Ref. [6] 10.0 (7) s.o(v) 2.4(v) 13.1 (7) 4.1(v) 21.6(10) 40.8 (14) Ref [30] is 0.7 eV.…”

Section: Of Overlapping Statesmentioning

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: 93%

“…(12) are factorized into parts determined by the excitation and decay processes. However, the physical meaning of the parameters is not the same as in the case of an isolated level [22].…”

Section: Of Overlapping Statesmentioning

confidence: 99%

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

et al. 1994

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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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“…Meanwhile, a number of experimental and theoretical investigations have been done by several groups (e.g. Kämmerling et al 1990, Hergenhahn et al 1991, Chen 1993; for further references we refer to the cited papers and to the recent review by Schmidt (1992)). Measuring the angular distribution can yield more refined information, in the sense of a complete experiment (e.g.…”

Section: Introductionmentioning

confidence: 99%

Absolute Auger rates, relative intensities and angular distribution for the KLL spectra of Auger electrons from laser-excited sodium

Lohmann¹,

Fritzsche²,

Larkins³

1996

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. The absolute Auger rates, relative intensities and the angular anisotropy coefficients of Auger electrons have been calculated for the KLL Auger spectra of laser-excited sodium atoms. Where in closed-shell atoms the KLL Auger lines have to be isotropic this is no longer valid for certain Auger transitions in open-shell systems. To study the KLL Auger spectra of 3s → 3p excited sodium atoms we calculated the Auger matrix elements within the multiconfigurational Dirac-Fock model using the intermediate coupling scheme for representing the atomic states. The intensities and angular distribution parameters are discussed together with theoretical predictions in the LS coupling and compared to results obtained for the sodium ground-state KLL Auger transitions. We also discuss the influence of overlapping initial fine-structure states on the Auger dynamics. Large anisotropy coefficients are predicted, even for the case of a non-resolved initial-and final-state fine structure.

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Relativistic-intermediate-coupling calculations of angular distributions in resonant Auger decay

Cited by 39 publications

References 19 publications

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

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

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

Absolute Auger rates, relative intensities and angular distribution for the KLL spectra of Auger electrons from laser-excited sodium

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