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Schneider, Dieter; Zeitz, W.‐D.; Kowallik, R.; Schiwietz, G.; Schneider, T.; Stolterfoht, N.; Wille, U.

doi:10.1103/physreva.34.169

Cited by 21 publications

(8 citation statements)

References 19 publications

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“…An error of about 50% must be taken into account for the absolute field-ionization yields and is mainly due to the uncertainty of the transmission of the tandem spectrometer and to coherence effects. 9 Furthermore, Table I shows very good agreement between the theoretical and experimental P(n)n 3 quantum-state populations for the gas as well as for the foil case. Within the experimental error, the ratios of the P(n)n 3 between foil and gas excitation are found to increase with increasing projectile Z.…”

Section: Formation Of Rydberg States In Fast Ions Penetrating Thin Camentioning

confidence: 57%

“…The experimental setup is similar to the one described in detail by Schneider et al 9 A tightly collimated beam of ions traverses a carbon-foil or gas target. The thickness of the carbon foil is 20 /zg/cm 2 ; the gas cell is 10 cm long and the gas pressure in the cell is maintained at 38 mTorr to ensure single-collision conditions with respect to charge transfer and excitation.…”

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confidence: 99%

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Formation of Rydberg states in fast ions penetrating thin carbon-foil and gas targets

1987

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The absolute field-ionization yields of gas-and foil-excited Rydberg states are measured for different fast beam ions. From the yields a direct comparison of the quantum-state populations of high-rt states in > 100) produced by gas and foil excitation could be obtained. Model calculations are consistent with the high-n states being predominantly produced by excitation of the projectile or capture of target electrons in the last layers of the solid target.PACS numbers: 34.50.Fa, 34.60.+Z, 34.70.+e Near-threshold excitation, where electron capture into projectile-centered continuum or Rydberg states occurs in interactions of fast highly charged projectiles with solids, has been intensively investigated for some time. l Yet there is still no sufficient theoretical model to account for the various experimental findings. Studies concerned with the formation of Rydberg states (highly excited hydrogenlike states with large n quantum numbers) in fast ions emerging from foil targets help to provide an understanding of the processes involved in the threshold excitation in ion-solid interactions. 2 Since Rydberg states have considerably larger electronic orbitals than the lattice spacings in a solid, it is assumed that the Rydberg states are formed by collisional interactions in the last layers of the penetrated solid. One of the major questions addressed in this research is the effect of various bulk and surface processes in the ion-solid interaction on the population of Rydberg states, the angular distribution of convoy electrons, and their mean free path. Burgdorfer and co-workers 3 have developed a classical transport theory for electrons near threshold under the influence of stochastic scattering processes in the solid and a strong ionic Coulomb field. This approach may illuminate the problem of the stability of Rydberg orbits under the influence of stochastic perturbations as well as the transmission of convoy electrons through solids.Recently reported results, where the delayed Lyman-a and -p radiation has been measured from fast d> -10 a.u.) foil-excited ions, suggested that the Rydberg-state production accentuates high-/ states and is more than 2 orders of magnitude larger than could be explained by last-layer electron capture. 4 Measurements of the light emission from foil-excited Rydberg states near the yrast line in fast F-and Si-beam ions have also been reported recently. 2 In both cases, the data were described quite well with an empirical parametrization for the average population per nl Rydberg state, with the light emission showing a dependence on the core charge of the penetrating ions as well as on the nuclear charge. This is consistent with a picture where electron capture dominates the production of Rydberg states. The Rydbergstate population of a certain final charge state seems to be almost strictly proportional to the corresponding population of a given core-charge-state fraction. It is, however, not possible to distinguish between capture of target electrons and recapture of cusp electrons or suc...

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Section: Formation Of Rydberg States In Fast Ions Penetrating Thin Camentioning

confidence: 57%

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confidence: 99%

Formation of Rydberg states in fast ions penetrating thin carbon-foil and gas targets

1987

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“…A more detailed description of the experimental procedure is given by Schneider et al [3]. The experimental set-up consists of a target chamber, the differentially pumped scattering cell and two electron spectrometers in tandem, where the first parallel-plate analyzer separates the forward emitted electrons from the ion beam and the second high-resolution electrostatic analyzer is used to accumulate zero-degree Auger spectra.…”

Section: Experimental Methodsmentioning

confidence: 99%

Doubly excited states of three-electron systems (Z=2 to 10) below the (1s21)SLπ threshold

Bruch

Wang

Schneider

et al. 1991

Z Phys D - Atoms, Molecules and Clusters

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A b s t r a c t A systematic experimental and theoretical study of doubly excited ls2tnl' states of three-electron ions has been performed. Theoretically the truncated diagonatization method (TDM) has been used to generate both nonrelativistic and relativistic energy values, wave functions and quantum defects for 42 different Rydberg series converging to four different thresholds, i.e. (ls2s)SS ~, ~S ~ and (ls2p)SP °, i p o This comprehensive data base has been used to classify recent high resolution Auger electron spectra arising from Li-like states. Specifically we have analyzed He-, C s+, O s+ and N J + Auger electron data produced by double electron capture in slow ionatom collisions. Numerous new lines associated with (ls21nl') Rydberg levels have been identified.

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“…For completeness purposes we discuss the possibility for field ionization of electrons from Rydberg states of the projectile ion, as this has been an issue for electrostatic zero-degree electron spectrometers [31,32]. We consider that the magnetic field of the first spectrometer dipole magnet may lead to field ionization of U 88+ (1s 2 2snl ) projectile ions, that have captured a target electron into a highly excited nl state, as discussed in Ref.…”

Section: B Electron Spectrometermentioning

confidence: 99%

Radiative electron capture to the continuum in U89++N2 collisions: Experiment and theory

Hillenbrand¹,

Hagmann²,

Groshev³

et al. 2020

Phys. Rev. A

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For U 89+ projectiles colliding at a beam energy of 75.91 MeV/u with a N 2 target, we present a coincidence measurement between the cusp electrons emitted under an angle of 0 • with respect to the projectile beam and the photons emitted under a polar angle of 90 • . This radiative-electron-capture-to-continuum cusp directly probes the theory of electron-nucleus bremsstrahlung up to the high-energy endpoint in inverse kinematics. In the present study, significant improvement with respect to the experimental accuracy has been achieved, resulting in a finer agreement between experimental and theoretical results.

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Effects of external electric fields on high Rydberg states formed in foil and gas interactions of 85-MeVNe6+ions

Cited by 21 publications

References 19 publications

Formation of Rydberg states in fast ions penetrating thin carbon-foil and gas targets

Formation of Rydberg states in fast ions penetrating thin carbon-foil and gas targets

Doubly excited states of three-electron systems (Z=2 to 10) below the (1s21)SLπ threshold

Radiative electron capture to the continuum in U89++N2 collisions: Experiment and theory

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