X-ray multielectronic photoexcitations near the<i>K</i>edge of xenon

Deutsch, Moshe; Kizler, P.

doi:10.1103/physreva.45.2112

Cited by 38 publications

(15 citation statements)

References 27 publications

(25 reference statements)

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“…Noble gases, which are easy to manipulate experimentally and are also easier to handle theoretically, are particularly suited for absorption studies of multielectron excitations. Relatively strong multielectron spectral features have been identified in the measured high-resolution Kand L-edge x-ray-absorption spectra of several noble gases [2,[8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 98%

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High-resolution x-ray-emission study of1s4pand1s3dtwo-electron photoexcitations in Kr

et al. 2014

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High-energy-resolution photoexcited KN 2,3 x-ray-emission measurements were carried out on krypton with the excitation energy tuned around the 1s4p and 1s3d double-excitation thresholds. Comprehensive two-dimensional resonant inelastic x-ray-scattering maps were recorded for the range of excitation and emission energies corresponding to both types of double excitations. The double-excitation signal could be clearly resolved from the dominant 1s ionization signal. The latter was subtracted from the measured maps, yielding isolated 1s4p and 1s3d photoexcitation spectra. Both two-electron excitation spectra are well described by a model spectrum built of consecutive bound-bound discrete transitions and shake-up and shake-off channels giving precise energies and intensities of the corresponding contributions. The obtained results are compared with other existing experimental values based on x-ray-absorption measurements and theoretical predictions.

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Section: Introductionmentioning

confidence: 98%

“…Multielectron photoexcitations in krypton were studied extensively using x-ray-absorption spectroscopy [11][12][13][14][15]. Schaphorst et al [13] provided absolute photoabsorption cross sections for [1snp,nd] excitations.…”

Section: Introductionmentioning

confidence: 99%

High-resolution x-ray-emission study of1s4pand1s3dtwo-electron photoexcitations in Kr

et al. 2014

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“…The near-K-edge spectra of neon [1], argon [2], krypton [3), and xenon [4] were measured with high resolution, showing a rich array of two-electron (2e) and even some three-electron (3e) excitations. In particular, the very detailed measurements of Deslattes et at.…”

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confidence: 99%

“…A reliable separation of the measured cross section into the contributions of individual transitions is an extremely complicated task requiring accurate cross-section and energy-level calculations. We will resort, therefore, to the admittedly somewhat arbitrary but previously employed [3,4,13] procedure of fitting a straight line just below the relevant feature, and calculating the ratio of the feature's height above this line to that of the K-edge jump, to obtain the "measured" relative cross section.…”

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Multielectronic excitations near theKedge of argon

1992

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High-resolution x-ray photoabsorption measurements on Ar near its K edge are reported. A number of new two-electron KM features were detected. The three-electron KM and the two-2 electron KL spectra were measured. The previously unresolved three-electron KM and the two-2 electron KL spectra were clearly resolved in this study. Identification of spectral features is discussed based on our Hartree-Fock and published Dirac-Fock [Dyall, J. Phys. B 16, 3137 (1983); Dyall and LaVilla, Phys. Rev. A 34, 5123 (1986)] energy-level calculations. PACS number(s): 32.80.Hd, 32.30. RjMultielectron processes in atoms depend sensitively on intra-atomic correlations and the dynamics of the excitation. They can provide, therefore, an insight into the electronic structure and the excitation process which goes beyond prevailing single-electron fixed-potential models.X-ray near-edge photoabsorption measurements in noble gases, which are free from extended x-ray-absorption finestructure (EXAFS) interference and probe the energies and cross sections directly, are particularly well suited for these studies. The near-K-edge spectra of neon [1], argon [2], krypton [3), and xenon [4] were measured with high resolution, showing a rich array of two-electron (2e) and even some three-electron (3e) excitations. In particular, the very detailed measurements of Deslattes et at.[2] on Ar were repeatedly used to test models for the excitation dynamics and the importance of effects, such as post-collisional interaction, exchange, ground-, and final-state correlations and relaxation [5 -8]. However, sharp features involving 2e ls3s and 3e 1s3lI' states could not be resolved in those synchrotron-radiation mes surements (underline denotes hole states). Furthermore, no ls2l features were reported to date for Ar, although such features were detected in Ne [1] and Kr [3]. We report here high-resolution measurements of the photoabsorption spectrum of Ar in the KM and KL regions.A number of previously unresolved 1s3p and ls3s features were detected, and the 3e KMz and 2e KL features were resolved. Tentative identification of these, based on our Hartree-Fock (HF) energy-only and published [9, 7] Dirac-Fock (DF) calculations, is also presented.The measurements were done at the EXAFS II mirrorfocused beamline at HASYLAB in a standard transmission EXAFS configuration, using an UHV-compatible double-crystal Si(111) monochromator. Harmonics were electively eliminated by detuning the monochromator crystals using a stabilization feedback control [10]. The fiux at the sample was~10 e photons/sec and the energy resolution LE-0.9 eV. Reference scans without sample were done to obtain absolute cross sections. Incident beam stability and measurements statistics were high 1.5 1.0-0.5-0 0 100 I 200 ENERGY (eV) 300 I 400 FIG. 1. Near-K-edge photoabsorption spectrum of Ar. Zero energy is at the edge, E~=3206.26 ev. enough to allow confident detection of features as small as 0,02pp of the K edge. The energy scale was established using the resonance line at [11] Ei, 4"--3203...

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“…A monatomic sample is readily available for elements of noble gas family: indeed, X-ray absorption spectra in the vicinity of K-and L-edges have been studied for most elements of the group [1][2][3][4][5]. The experimental data are used as a test for successive approximations in the theoretical calculation of photoabsorption cross-section.…”

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A double cell for X-ray absorption spectrometry of atomic Zn

Mihelič

Kodre

Arčon

et al. 2002

Nuclear Instruments and Methods in Physics Research Section B:

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A high-temperature cell with a double wall design has been constructed for X-ray absorption spectrometry of metal vapors. The inner cell, assembled from a corundum tube and thin plates without welding or reshaping, serves as a container of the vapor sample. It is not vacuum tight: instead, the outer tube provides inert atmosphere. Several spectra of K-edge atomic absorption of Zn were obtained in the stationary working regime below the Zn boiling point. The Kedge profile shows an extremely strong resonance and, above the continuum threshold, coexcitations of the outer electrons. Ó 2002 Elsevier Science B.V. All rights reserved.PACS: 78.70.Dm; 39.90.+d Keywords: X-ray atomic absorption; Zn vapor; Zn K-edge Absorption spectrometry of elements in monatomic state is of continuous interest in atomic physics and in structural analysis. A monatomic sample is readily available for elements of noble gas family: indeed, X-ray absorption spectra in the vicinity of K-and L-edges have been studied for most elements of the group [1][2][3][4][5]. The experimental data are used as a test for successive approximations in the theoretical calculation of photoabsorption cross-section. The details of the edge shape and tiny sharp features on the smooth monotonous decrease of the cross-section with energy -the multielectron excitations -reveal some peculiarities of the coupling schemes and configuration interaction in these atoms [6,7].Apart from noble gases, few elements can be prepared in a monatomic gas state. The volatile elements mostly form bi-or polyatomic molecules, the non-volatiles require complex high-temperature Nuclear

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X-ray multielectronic photoexcitations near theKedge of xenon

Cited by 38 publications

References 27 publications

High-resolution x-ray-emission study of1s4pand1s3dtwo-electron photoexcitations in Kr

High-resolution x-ray-emission study of1s4pand1s3dtwo-electron photoexcitations in Kr

Multielectronic excitations near theKedge of argon

A double cell for X-ray absorption spectrometry of atomic Zn

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