Photoion spectra in coincidence with threshold electrons near the Xe 4d ionization limits

Hayaishi, T; Yagishita, Akira; Shigemasa, E.; Murakami, E; Morioka, Y

doi:10.1088/0953-4075/23/24/005

Cited by 23 publications

(23 citation statements)

References 23 publications

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“…On the other hand, the threshold-electron spectrum comprises structures due to 3d excitation, 3d ionization, and 3d '4p 'nl shake-up processes. The structures in the vicinity of the Kr 3d and Xe 4d thresholds have been previously studied by Heimann et al [16] and Hayaishi et al [17,18] an Auger shake-olf process following 31ionization (Ref. [6]).…”

Section: Analyzer With the Aid Of Multiconfigurationalmentioning

confidence: 99%

Manifestation of Kr 3dand Xe 4dconjugate shake-up satellites in threshold-electron spectra

et al. 1991

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Threshold-electron spectra have been measured in the vicinity of Kr 3d and Xe 4d shake-up regions using a threshold-electron analyzer. With the aid of multiconfigurational Dirac-Fock energy calculations, we have uncovered conjugate shake-up satellites in the spectra. The conjugate shake-up process has been found to be strongly enhanced at the Kr 3d and Xe 4d shake-up thresholds.The Kr 3d and Xe 4d shake-up spectra were first observed using x-ray photoelectron spectroscopy (XPS) [1][2][3][4]. Those photoelectron spectra exhibit satellite structures at slightly lower kinetic energies than the main photolines. The structures were interpreted to be normal shake-up satellites induced by monopole transitions, 3d '4p 'np in Kr and 41 '5p 'np in Xe, with the support of energy calculations [3,4]. On the other hand, conjugate shake-up structures induced by dipole transitions have been observed in a Ne ls photoelectron spectrum [4].The conjugate shake-up process results in the appearance of very weak structures (0.05% of the ls main photoline) in XPS. No observation of conjugate shake-up spectra in Kr 3d and Xe 4d have been recognized in XPS so far.Recently, shake-up spectra in the Kr 3d and Xe 4d ionization regions have been studied by Medhurst et al. [5] and Hayaishi et al. [6]. Medhurst et al. measured a threshold-electron spectrum of Xe at photon energies of 60-150 eV. The spectrum shows shake-up structures that are superimposed on the low-energy side of a broad maximum corresponding to the Xe 4d giant resonance [71. Hayaishi et al. measured spectra of doubly and triply charged ions in coincidence with threshold electrons at photon energies of 80-280 eV in Kr and 60-160 eV in Xe. Those photoion spectra show broad shake-up structures. The spectra observed by Medhurst et al. and Hayaishi et al. could not resolve fine structures because of low spectral resolution.The conjugate shake-up process in Ne 1s has been theoretically explained by different approaches, such as many-body perturbation theory [8,9], calculation of overlap integrals [10],and channel coupling [11].These studies predict that the probability for conjugate shake-up processes increases as the photon energy decreases.In the present Rapid Communication, we report threshold-electron spectra of the Kr 3d and Xe 4d shakeup regions. The purpose of this work is to identify conjugate shake-up structures of Kr and Xe by comparison with theoretical calculations.The experiment was performed at the BL-3B beam line of the 2.5-6eV electron storage ring at the Photon Factory in the National Laboratory for High Energy Physics, Tsukuba, Japan. The synchrotron radiation was monochromatized using a 24-m spherical grating monochromator [12]. A gold-coated laminar grating with 600 lines/mm was used. The spectral resolution was about 0.08 eV at 100-eV photon energy. Apparatus used in the present experiment have been described previously [13].A threshold-electron analyzer is composed of a parallel-tube assembly and an energy selector. The parallel-tube assembly is made of pipes wi...

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Section: Analyzer With the Aid Of Multiconfigurationalmentioning

confidence: 99%

Manifestation of Kr 3dand Xe 4dconjugate shake-up satellites in threshold-electron spectra

et al. 1991

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“…These processes were extensively studied by Carlson, Krause and co-workers [33][34][35][36][37][38] in photoionization. The advent of new experimental techniques in photon-atom research in the last two decades has contributed to a detailed knowledge of the Auger-type processes, the intermediate steps and cascades [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53].…”

Section: Introductionmentioning

confidence: 99%

Antiproton, proton and electron impact multiple ionization of rare gases

Montanari¹,

Miraglia²

2012

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

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We present a study on multiple ionization of Ne, Ar, Kr and Xe by antiproton, proton and electron impact. Four different aspects are involved in this work. First, the theoretical calculations of ionization probabilities by impact of antiprotons and protons, in an extended energy region (25 keV to 10 MeV), using the continuum distorted-wave eikonal initial state approximation and the first Born approximation. Second, the inclusion of Auger-type post-collisional contributions through experimental photoionization branching ratios. These contributions to multiple ionization are very important in the high-energy region. Third, the comparison with the available experimental data on multiple ionization by protons and antiprotons in the extended energy range, and by electrons for high-impact velocities, where proton, antiproton and electron impact results are expected to converge. It is also the energy region where direct ionization does not explain the experimental results, and the post-collisional ionization is the main contribution to multiple ionization. And fourth, total ionization cross sections are calculated and compared with the antiproton, proton and electron experimental data, showing the importance of Auger-type multiple ionization for heavy targets even at the level of total cross sections. Gross and count cross sections are scrutinized.

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“…In the case of inner-shell photoionization followed by DA decay, PCI implies the interaction of the emitted photoelectron with the two subsequent Auger electrons and with the field of the ion, which varies during the Auger decay. Previously, PCI effects in DA processes have been investigated experimentally by means of threshold photoelectron yields measured in the vicinity of inner-shell vacancies: Kr 1s −1 , Kr 2p −1 , Kr 3p −1 , Ar 1s −1 , Ar 2p −1 , Xe 4p −1 , and Xe 4d −1 [9][10][11][12][13][14][15][16][17][18]. Also an investigation of PCI-distorted photoelectron lines associated with DA decay and measured in coincidence with the two ejected Auger electrons has been carried out more recently for the case of Ar 2p photoionization [19].…”

Section: Introductionmentioning

confidence: 99%

Influence of double Auger decay on low-energy 3dphotoelectrons of krypton

et al. 2012

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Influence of double Auger decay on low-energy 3d photoelectrons of krypton.Physical Review A. Atomic, Molecular, and Optical Physics, 86(2) Effects of postcollision interaction (PCI) observable in low-energy 3d photoelectron spectra of Kr, which are associated with double Auger decay of the created inner-shell vacancy, are investigated by a combined experimental and theoretical approach. Measurements are based on an efficient multielectron coincidence method. Calculations have been carried out in the framework of a semiclassical approach. Our investigation reveals strong PCI distortion of the photoelectron line shapes, which depends on the kinematics of the process and the characteristics of the double Auger decay.

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Photoion spectra in coincidence with threshold electrons near the Xe 4d ionization limits

Cited by 23 publications

References 23 publications

Manifestation of Kr 3dand Xe 4dconjugate shake-up satellites in threshold-electron spectra

Manifestation of Kr 3dand Xe 4dconjugate shake-up satellites in threshold-electron spectra

Antiproton, proton and electron impact multiple ionization of rare gases

Influence of double Auger decay on low-energy 3dphotoelectrons of krypton

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