Relativistic distorted-wave calculation of electron impact excitation of caesium

Zeman, V.; McEachran, R P; Stauffer, A D

doi:10.1088/0953-4075/27/14/046

Cited by 21 publications

(8 citation statements)

References 28 publications

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“…For the excited bound states of argon, we included those states where one of the electrons in the outer 3p or 3p valence shells was excited to a higher-lying valence shell with n = 4 or 5. In particular, the following 14 In the incident channel, denoted by 0 , we now let the wave number of the incident electron be k 0 and its angularmomentum quantum numbers be (l 2 ,j 2 )κ 2 . The radial integral equations for the large and small components of the scattering wave functions F 0 (x) and G 0 (x) can be expressed in matrix 022707-3 form as…”

Section: B the Rop Methodsmentioning

confidence: 99%

“…In this paper, it was also used used to calculate the orientation and alignment parameters associated with the transition from the ground state to the above excited states. The RDW method was subsequently used in a similar manner in the treatment of the alkaline earths (Srivastava et al [12,13]) and alkali-metal atoms (Zeman et al [14,15]) again in the low-energy range up to a few hundred electronvolts.…”

Section: Theorymentioning

confidence: 99%

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Understanding energy loss in large-angle scattering of keV electrons from Ar and Ne

et al. 2011

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We present measurements of the spectra of electrons with energy between 0.6 and 2.25 keV elastically and inelastically scattered from Ar and Ne over large angles (from 3 • to 135 • ). The intensity of the first loss feature [np → (n + 1)s], relative to that of the elastic peak, was determined and compared with the results of relativistic distorted-wave calculations (for the energy loss part) and a relativistic optical potential method (for the elastic peak). Good agreement was found. The distorted-wave calculations are compared with first Born calculations. At small angles, both theories coincide and estimates of the optical oscillator strength are obtained. However, at large angles, the first Born approximation predicts negligible intensity, in strong contrast to the distorted-wave theory and the experimental data. The implications of these results for the interpretation of measurements of the generalized oscillator strength are discussed.

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Section: B the Rop Methodsmentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Understanding energy loss in large-angle scattering of keV electrons from Ar and Ne

et al. 2011

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“…This method was originally developed for closed-shell atoms by Zuo et al [31] and then successfully applied to the heavy noble gases [32], as well as cadmium [33] and mercury [34]. It was then modified by Zeman et al [35] in order to treat the electron-impact excitation of cesium and other alkali-metal atoms. Subsequently, this latter RDW approach was applied to the alkali-metal-like atoms silver and gold [9,36] in order to excite the resonance transitions.…”

Section: A Rdw Theorymentioning

confidence: 99%

Electron-impact excitation of the (4d105s)S1/22→

et al. 2021

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“…In heavy and moderately heavy atoms such as silver (Z = 47), these effects are manifested in the fine-structure splitting of the excited states. The RDW method formulated by Zuo et al [13] includes both the fine structure of the atom and the spin-orbit coupling of the scattered electrons and was used for the calculation of the excitation processes in many electron-atom systems [7,[14][15][16][17] including the electronsilver excitation [1,18]. In the present study we extend the RDW method to the electron excitation of the 4d 10 5p states of silver (a fine-structure doublet with the lower level having J = 1/2 and the upper level J = 3/2 with an energy splitting of 0.114 eV).…”

Section: Theorymentioning

confidence: 99%

Electron-impact excitation of silver

et al. 2015

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We measure the differential cross sections (DCSs) for the electron-impact excitation of the combined (two fine-structure levels) resonant 4d 10 5p 2 P1/2,3/2 and 4d 9 5s 2 2 D5/2 states in silver from the 4d 10 5s 2 S1/2 ground state. A comparison with the predictions of the relativistic distorted-wave (RDW) approximation model is carried out. Relativistic distorted-wave calculations are performed for each level separately and are combined to compare with the measurements. Both the experimental and theoretical results are obtained at incident electron energies E 0 of 10, 20, 40, 60, 80, and 100 eV and scattering angles θ from 10°up to 150°(experiment) and from 0°t o 180°(calculations). Absolute values for the experimental DCSs are obtained by normalizing relative DCSs to theoretical RDW results at 40°at all energies except at 10 eV, where we performed the normalization of the relative DCSs at 10°to our previous small-angle experimental DCS values [S. D. Tošić et al., Nucl. Instrum. Methods Phys. Res. Sect. B 279, 53 (2012)]. The integrated cross sections, which include integral Q I , momentum transfer Q M , and viscosity Q V cross sections, are determined by numerical integration of the absolute DCSs.

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Relativistic distorted-wave calculation of electron impact excitation of caesium

Cited by 21 publications

References 28 publications

Understanding energy loss in large-angle scattering of keV electrons from Ar and Ne

Understanding energy loss in large-angle scattering of keV electrons from Ar and Ne

Electron-impact excitation of the (4d105s)S1/22→

Electron-impact excitation of silver

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