Auger spectroscopy on heavy-ion-atom collisions. II. Na+, Mg+, Al+, P+, S+, Cl+-Ar collisions

Dahl, P.; Rodbro, M; Hermann, G.; Fastrup, B.; Rudd, M. E.

doi:10.1088/0022-3700/9/9/022

Cited by 59 publications

(11 citation statements)

References 22 publications

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“…Collisional excitation by low-energy ion bombardment (≤5 keV) of sodium, such as we consider in this study, can only lead to inner-shell excited states with a single 2 p vacancy. For these energies, excitation of a single 2 s vacancy [ 33 , 35 ] or the formation of a doubly excited 2 p state (2 p 4 ) in sodium [ 21 ] can be excluded [ 33 ]. In the sodium halides, the ionic lattice consists of sodium and halogen ions that are essentially closed-shell structures (e.g., Na + 2 p 6 and Cl − 3 p 6 ) [ 42 , 43 ].…”

Section: Discussionmentioning

confidence: 99%

“…The gas-phase collisional-excitation spectra reported for (Na + + He 0 ) [ 34 ], (Na + + Ne 0 ) [ 32 ], and (Na + + Ar 0 ) [ 33 ] have all been generated using gas-target pressures consistent with a single–collision regime in which both excitation and electron capture occur in a single encounter (as in Sequence A.1). These gas-phase electron spectra are shown in Fig.…”

Section: Gas-phase Ne and Ar Collisional Spectra Of Sodiummentioning

confidence: 99%

“…13 . In this representation, we plot the observed sodium line intensities (normalized to the most intense line) as a function of electron energy for Na + gas-phase collisions with neutral atoms of Ar [ 33 ], Ne [ 32 ], and He [ 34 ] as well as for Ar + collisions with a NaCl crystal. Only the more intense transitions are included in this comparison.…”

Section: Excitation States Deexcitation Energies and Spectral LImentioning

confidence: 99%

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Bombardment induced electron-capture processes at sodium halide surfaces

Fine¹,

Szymoński²,

Kołodziej³

et al. 1996

J. Res. Natl. Inst. Stand. Technol.

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Discrete features observed in the energy distribution of electrons emitted from ion-bombarded sodium halide surfaces can be attributed to a new type of collisional deexcitation mechanism. Such a mechanism involves sodium atoms in bombardment-excited autoionizing states that are the result of cascade collisions within the crystal lattice. This deexcitation process, in contrast to that for a metal, is not simply a consequence of the inner-shell lifetime of the initial collisionally excited sodium Na+* ion. Rather, the deexcitation consists of a sequence of lattice collisions during which the excited Na+* ion captures an electron to form the inner-shell-excited Na0* states responsible for the observed transitions. The formation of such autoionizing Na0* states is described within the framework of a new model in which excitation processes and localized collisional electron-transfer mechanisms are taken into account. These localized electron-transfer processes make possible new channels for electronic deexcitation, chemical dissociation, and defect production; they are critical for understanding inelastic ion-surface collisions in solids.

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Section: Discussionmentioning

confidence: 99%

Section: Gas-phase Ne and Ar Collisional Spectra Of Sodiummentioning

confidence: 99%

Section: Excitation States Deexcitation Energies and Spectral LImentioning

confidence: 99%

See 1 more Smart Citation

Bombardment induced electron-capture processes at sodium halide surfaces

Fine¹,

Szymoński²,

Kołodziej³

et al. 1996

J. Res. Natl. Inst. Stand. Technol.

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“…The excitation mechanism is considered to be electron promotion (FANO et al, 1965); the probability of electron emission increases with decreasing atomic mass, i.e., decreasing fluorescence yield. Auger electrons constitute a discrete portion of the ejected-electron spectrum at all projectile velocities, but there is little experimental evidence (OGURTSOV et al, 1970;STOLTERFOHT et al, 1974;DAHL et al, 1976) to support the notion (PARILIS et al, 1960) that the majority of ejected electrons --even of high-energy electrons .-should have that origin ( fig. 3).…”

Section: Primary Ionization Processesmentioning

confidence: 99%

Electron Emission from Solids During Ion Bombardment. Theoretical Aspects

Sigmund

Tougaard

1981

Springer Series in Chemical Physics

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This contribution is devoted to the theory of ion-induced electron emission from solids, with the emphasis on bulk as opposed to surface processes. With the aim of describing yields and energy spectra of emitted electrons, we discuss pertinent elementary processes, l.e., primary and secondary excitation, electron transport, and escape. I'lith regard to the primary process, proper distinction is made between high-and low-velocity ions, and reference is made to the physics of ion-atom collisions as well as to dielectric stopping theory. The discussion of secondary excitation makes reference to the theory of ionization cascades as well as atomic recoil cascades. Electron transport is considered first in an infinite medium and subsequently, within the diffusion approximation, in a semi-infinite medium. Special attention is paid to pertinent electron mean free paths, inelastic processes being estimated on the basis of the free-electron-gas model of a solid. We find that the neglect of elastic scattering of electrons in most existing treatments of electron emission has severe consequences on the interpretation of structure in measured electron spectra. Comments are made on the escape depth of electrons.

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“…Both experimentalists [1][2][3] and theorists [4][5][6][7][8][9][10][11][12][13][14][15][16] have shown great interest in the innershell excitation of alkali metal atoms and alkali-like ions, because inner-shell excitation may lead to autoionization which has an important role in explaining the structure observed in the total ionization cross-section curves for electron impact. Consequently, the reliable theoretical calculation of position of the autoionizing level and the theoretical estimate of the excitation threshold, which is used in the calculation of the oscillator strengths, of both length and velocity forms, is of special interest.…”

Section: Introductionmentioning

confidence: 99%

Excitation energies and oscillator strengths for the 1s 2 2s 2 2p 6 3s 2 3p 6 3d 2 D e →1s 2 2s 2 2p 6 3s 2 3p 5 3d 2 2 P o , 2 D o , 2 F o transitions in V4 +

2011

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We have calculated the excitation energies ( E) and optical oscillator strengths (OOS), of both length ( f L ) and velocity ( f V ) forms, for the 1s 2 2s 2 2 p 6 3s 2 3 p 6 3d 2 D e → 1s 2 2s 2 2 p 6 3s 2 3 p 5 3d 2 2 P o , 2 D o , 2 F o transitions in V 4+ ion of the potassium isoelectronic sequence by employing multiconfiguration Hartree-Fock (MCHF) method exactly in the same way as we did in our earlier work (Tiwary et al, Pramana -J. Phys. 46, 381 (1996)). We have compared the available relevant experimental data and our earlier theoretical results obtained by employing the configuration interaction (CI) method (Tiwary et al, J. Phys. B: At. Mol. Phys. 16, 2457). Our present investigation clearly demonstrates that the MCHF method is more accurate than the CI method.

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Auger spectroscopy on heavy-ion-atom collisions. II. Na⁺, Mg⁺, Al⁺, P⁺, S⁺, Cl⁺-Ar collisions

Cited by 59 publications

References 22 publications

Bombardment induced electron-capture processes at sodium halide surfaces

Bombardment induced electron-capture processes at sodium halide surfaces

Electron Emission from Solids During Ion Bombardment. Theoretical Aspects

Excitation energies and oscillator strengths for the 1s 2 2s 2 2p 6 3s 2 3p 6 3d 2 D e →1s 2 2s 2 2p 6 3s 2 3p 5 3d 2 2 P o , 2 D o , 2 F o transitions in V4 +

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