High-resolution projectile Auger spectroscopy for Li, Be, B and C excited in single gas collisions. I. Line energies for prompt decays

Rodbro, M; Bruch, R.; Bisgaard, P.

doi:10.1088/0022-3700/12/15/009

Cited by 226 publications

(142 citation statements)

References 78 publications

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“…In TABLE I to TABLE III we present the total and excitation energies of our calculations with PW and LYP correlation potentials and energy functionals for inner-shell excited states 1s2sns 2,4 S (n = 2 ∼ 8), 1s2snp 2,4 P (n = 2 ∼ 8), and 1s2p 2 2 S, 2,4 P , and 2 D, respectively. For comparison we also list in these tables representative experimental data [29,31,34] as well as theoretical results obtained from calculations using density work-functional formalism (WF) [36], saddlepoint complex-rotation (SPCR) [37,38,39,40], extensive configuration-interaction calculation (ECI) [43,44,45,46], and Rayleigh-Ritz variational method (RRV) [49].…”

Section: A Inner-shell Excitation Of LImentioning

confidence: 99%

“…In [34] as well as theoretical results from WF [36], perturbation Z-expansion theory (PZE) [50,51], and perturbation Z-expansion theory with relativistic effects (RPZE) [34] To explore the feasibility of the approach to inner-shell excitation of atomic ions, we also apply the procedure to inner-shell excited-state calculations of positive ions Ne + , Ne 2+ , and Ne 3+ . In TABLE V we present the excitation energies of optically allowed transitions involved in inner-shell excited states of these ions along with the theoretical results of multiconfiguration DiracFock (MCDF) method [52].…”

Section: B Inner-shell Excitation Of Bmentioning

confidence: 99%

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Inner-shell excitation of open-shell atoms: a spin-dependent localized Hartree–Fock density-functional approach

Zhou¹,

Chu²

2007

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

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The spin-dependent localized Hartree-Fock (SLHF) density-functional approach is extended to the treatment of the inner-shell excited-state calculation of open-shell atomic systems. In this approach, the electron spin-orbitals in an electronic configuration are obtained by solving Kohn-Sham (KS) equation with SLHF exchange potential and the Slater's diagonal sum rule is used to evaluate the multiplet energy of an inner-shell excited state from the single-Slater-determinant energies of the electronic configurations involved. This approach together with the correlation potentials and energy functionals proposed by Perdew and Wang's (PW) or Lee, Yang, and Parr's (LYP) have been used to calculate the total and excitation energies of inner-shell excited states of open-shell atomic systems: Li, B, Ne + , Ne 2+ , Ne 3+ , and Na. The results with the PW and LYP energy functionals are in overall good agreement with each other and also with available experimental and other ab initio theoretical data. Some new results for highly excited inner-shell states are presented.

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Section: A Inner-shell Excitation Of LImentioning

confidence: 99%

Section: B Inner-shell Excitation Of Bmentioning

confidence: 99%

Inner-shell excitation of open-shell atoms: a spin-dependent localized Hartree–Fock density-functional approach

Zhou¹,

Chu²

2007

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

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“…Experimental studies of helium helped to establish the theory of autoionization [4] and to introduce a new set of quantum numbers [5] describing doubly excited states in two-electron systems. The challenge to extend these investigations to triply excited states in neutral lithium started with their observation in collision experiments [6]. Subsequently, photoexcitation experiments [7][8][9][10] allowed accurate measurements of the excitation energies, identification of many of the resonances, and the determination of some partial photoionization cross sections for autoionization into the lowest continua of the Li 1 ion.…”

Section: (Received 2 July 1999)mentioning

confidence: 99%

Angle-Resolved Photoelectron Spectrometry Studies of the Autoionization of the2s22p2P<

et al. 2000

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We have measured the angle-resolved energy dependence of the electrons emitted over the energy range of the triply excited 2s 2 2p 2 P lithium resonance using synchrotron radiation. We have also calculated the behavior of the angular distribution parameter b using the R-matrix approximation. Experimental and theoretical results are in good agreement and show deep minima in the 1s2p 1, 3 P ionic channels. The energy at which the minima occur does not coincide with the resonance energy, but is shifted towards higher energy. PACS numbers: 32.80.Hd, 32.80.Fb In this Letter, we present the results of a new experiment investigating the angular distribution of electrons emitted in autoionization of the lowest-energy triply excited state of atomic lithium. We made a critical comparison of the data with the results of advanced Rmatrix calculations performed in order to interpret the energy behavior of the angular distribution parameter b. Photons from the Advanced Light Source (ALS) photoexcited the 2s 2 2p 2 P hollow lithium state both on and off resonance. The electrons emitted were angularly analyzed with a cylindrical mirror analyzer (CMA) electron spectrometer. The experimental results reveal a pronounced energy dependence of the angular distribution parameter b in the Li 1 1s2p 1, 3 P´l satellite channels, in good agreement with theoretical prediction. Both experiment and theory show that the minima in the b profiles occur on the high energy side of the resonance.From the early 1960s [1], doubly excited states of helium have provided the ideal case for studying the threebody system of two correlated electrons interacting with the nucleus. Recent investigation on this system achieved very high resolution photoabsorption [2] and photoelectron [3] measurements. Experimental studies of helium helped to establish the theory of autoionization [4] and to introduce a new set of quantum numbers [5] describing doubly excited states in two-electron systems. The challenge to extend these investigations to triply excited states in neutral lithium started with their observation in collision experiments [6]. Subsequently, photoexcitation experiments [7][8][9][10] allowed accurate measurements of the excitation energies, identification of many of the resonances, and the determination of some partial photoionization cross sections for autoionization into the lowest continua of the Li 1 ion. Most recently, the investigation of this system received strong impetus from the use of a third generation storage ring delivering high-brightness photon beams in the photon energy range (140-200 eV). Highresolution partial cross sections were determined for triple excitation of lithium atoms [11,12] including a classification of many of the states into Rydberg series. The lowestenergy triply excited state in which all three electrons have the same principal quantum number ͑n 3͒ was also measured [13,14]. Theoretical calculations involving various approximations (R matrix [10-13], saddle point [15]) were carried out providing good agreement w...

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“…The third electron makes the theoretical and experimental study of hollow lithium states an even greater challenge than that of helium. Although triply excited states of lithium were first observed in collision experiments [6][7][8], only photon-excitation experiments provide the selectivity, sensitivity, and resolution required to unravel the many hollow lithium resonances. The dipole selection rules ensure that only 2 P o final states can be photoexcited from the ground state of the lithium atom.…”

mentioning

confidence: 99%

High Resolution Measurements of Partial Photoionization Cross Sections in Hollow Lithium: A Critical Comparison with Advanced Many-Body Calculations

et al. 1996

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Photoelectron data for hollow lithium states obtained with unprecedented high spectral resolution and sensitivity are presented. A critical comparison is made with the most recent theoretical results. Partial cross sections are measured providing the first definitive test of advanced ab initio calculations for this highly excited four-body atomic system. [S0031-9007(96)00241-4] PACS numbers: 32.80. Fb, 32.80.Hd In this Letter, we present photoelectron data for hollow lithium states obtained with unprecedented spectral resolution (0.019 eV) and sensitivity which allows a critical comparison with the most advanced recent theoretical calculations. The partial cross sections are measured and resonance profile parameters are determined. In addition, we have used the R-matrix approximation to calculate ab initio the partial photoionization cross sections into all continuum channels of the Li 1 ion over a wide photon energy range. The experimental results provide the first definitive test of such advanced calculations for this highly excited atomic system.The photoexcitation and decay dynamics of hollow lithium atoms, in which all three electrons are in excited states, have become the subject of intense recent experimental and theoretical interest. The single-photon threeelectron excitations depend entirely on electron-electron correlation interactions and so hollow lithium atoms constitute an ideal four-body Coulomb system for testing the most advanced atomic theories. Following the first photon-excited observation [1] of the lowest hollow atom resonance (1s 2 2s 2 S ! 2s 2 2p 2 P), two total ion yield photoion experiments at high [2] and medium [3] spectral resolution measured the autoionization of several hollow states in both the Li 1 and Li 21 decay channels. Photoelectron spectrometry [4] was also used with low resolution to study the decay of the hollow lithium 2s 2 2p state into the different continua of the Li 1 ion. The 0.5 eV spectral bandpass of the latest experiment however limited the critical nature of the comparison with theory.Double K-shell excitations in atomic helium have culminated in recent ultrahigh resolution measurements [5]. The third electron makes the theoretical and experimental study of hollow lithium states an even greater challenge than that of helium. Although triply excited states of lithium were first observed in collision experiments [6][7][8], only photon-excitation experiments provide the selectivity, sensitivity, and resolution required to unravel the many hollow lithium resonances. The dipole selection rules ensure that only 2 P o final states can be photoexcited from the ground state of the lithium atom. Photoelectron spectrometry combines the advantages of photon excitation with the unique capacity to measure separately the many decay channels and to provide insight into decay dynamics. The key role played by hollow atom states in ion-surface interactions has also been recognized [9]. 0031-9007͞96͞76(21)͞3915(4)$10.00

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High-resolution projectile Auger spectroscopy for Li, Be, B and C excited in single gas collisions. I. Line energies for prompt decays

Cited by 226 publications

References 78 publications

Inner-shell excitation of open-shell atoms: a spin-dependent localized Hartree–Fock density-functional approach

Inner-shell excitation of open-shell atoms: a spin-dependent localized Hartree–Fock density-functional approach

Angle-Resolved Photoelectron Spectrometry Studies of the Autoionization of the2s22p2P<

High Resolution Measurements of Partial Photoionization Cross Sections in Hollow Lithium: A Critical Comparison with Advanced Many-Body Calculations

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