Nonadiabatic sliding model for rearrangement collisions

Dh, Jakubassa-Amundsen

doi:10.1103/physreva.32.2166

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…The measurement was made at a scattering angle of eP = 30 * 2" in the laboratory and includes capture from and to all shells. Figure 18 contains the experimental results together with a SPB calculation by Jakubassa-Amundsen (1984a, b, 1985) (see also Jakubassa-Amundsen 1985, Jakubassa-Amundsen andAmundsen 1985). The latter includes only capture to the H ground state, but from both Ne K and L shells; the capture to higher hydrogen states is expected to change the absolute values by 10-20%, but not the energy dependence across the resonance.…”

Section: Broadening Of the Elastic Proton Scattering Resonance L3n(15...mentioning

confidence: 99%

“…below the Coulomb barrier), the collision happens adiabatically enough that molecular orbitals can be established, at least by the fast moving inner-shell electrons (Fano and Lichten 1965), and a molecular basis will be more appropriate (see below). A hybrid approach uses in this case atomic wavefunctions located at an 'effective united atom' centre somewhere on the axis between projectile and target nucleus, with an R-dependent 'effective united atom charge' Lerf (Briggs 1975, Andersen et a1 1976b, Amundsen 1978b, Jakubassa 1978, Kleber and Unterseer 1979, Anholt 1980, Jakubassa-Amundsen 1985. Effective origin and effective charge are usually determined variationally by minimising the K-shell binding energy for every nuclear distance R. Most recently a combination of moving atomic states at large internuclear distances and molecular orbitals at close distances has also been tested (Kimura and Lin 1985a, b) with good success in both symmetric and asymmetric light systems (2, + 2, < 10).…”

Section: Examples For Possible Choices Formentioning

confidence: 99%

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Interplay of nuclear and atomic physics in ion-atom collisions

Heinz¹

1987

Rep. Prog. Phys.

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The interplay between atomic and nuclear interactions in collisions between light and heavy ions is studied. The general theoretical description is outlined and analysed in a number of different limits (non-relativistic and relativistic electrons, semiclassical approximation, DWBA, fully quantal description) that have been used in practical applications. The two most important physical mechanisms for generating atomicnuclear interference, i.e. energy conservation and the introduction of additional phase shifts by nuclear reactions, are extracted and their universality in all scattering systems is stressed. The need for choosing different sets of basis states in light and heavy, symmetric and asymmetric systems, in order to achieve an economical theoretical description, is discussed in some detail. The resulting typical coupling matrix elements are analysed for their relative importance in atomic and nuclear excitations. The description of nuclear influence on atomic excitations in terms of a classical time delay caused by nuclear reactions is reviewed and its relationship to the underlying quantal character of the nuclear reaction is extracted.An experimental chapter reviews the existing data on nuclear-atomic interference. A large section covers proton-induced reactions (through isobaric analogue resonances or compound-nucleus formation) and their effects on bremsstrahlung spectra, K-hole probabilities, x-ray emission and electron capture. Inverse processes, where excitations within the electron shell modify the nuclear scattering, are also described. That structures in the atomic spectra can be consistently used to extract nuclear reaction times or average nuclear resonance widths is demonstrated for compound-nucleus formation in light-ion scattering and later applied to heavy-ion reactions. The experimental use of K-hole, 8-electron and positron production in heavy-ion reactions as an atomic clock for nuclear delay times is discussed; it is shown to give consistent results even in a region where direct determination of these times from measurement of nuclear reaction products is so far impossible.A prominent place in this review is reserved for spontaneous positron emission in supercritical heavy-ion collisions (Z,,, B 173); line structures predicted in the positron energy spectra may provide the most sensitive mechanism to isolate even very small fractions of the nuclear cross section proceeding through strongly delayed resonances or reaction channels. Attempts to use this idea to interpret the recently discovered

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Section: Broadening Of the Elastic Proton Scattering Resonance L3n(15...mentioning

confidence: 99%

Section: Examples For Possible Choices Formentioning

confidence: 99%

Interplay of nuclear and atomic physics in ion-atom collisions

Heinz¹

1987

Rep. Prog. Phys.

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“…This is an indication that an atomic theory like the impulse approximation or the inverse photoeffect fails for photon energies far off the peak where high momentum transfers to the active electron are required. Indeed, the influence of molecular effects which are calculated from the variational sliding center model 97 lead, even for high velocities, to an increase of the cross section in the tails of the REC peak.…”

Section: Capture Into Bound Statesmentioning

confidence: 99%

Theoretical Models for Atomic Charge Transfer in Ion-Atom Collisions

Jakubaßa-Amundsen

1989

Int. J. Mod. Phys. A

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The current theoretical models for the description of electron transfer in adiabatic, intermediate and high-energy collisions are reviewed. Particular emphasis is laid on the recent development of atomic theories suited for fast or asymmetric ion-atom encounters. The comparison with other theories and with experimental data on total as well as differential capture cross sections is used to determine the applicability of a specific model. The selected examples concern capture to bound states, to continuum states, radiative transfer as well as capture in the presence of an isolated nuclear resonance.

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Continuum Distorted Wave Methods in Ion—Atom Collisions

Crothers

Dubé

1992

Advances in Atomic, Molecular, and Optical Physics

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Nonadiabatic sliding model for rearrangement collisions

Cited by 4 publications

References 17 publications

Interplay of nuclear and atomic physics in ion-atom collisions

Interplay of nuclear and atomic physics in ion-atom collisions

Theoretical Models for Atomic Charge Transfer in Ion-Atom Collisions

Continuum Distorted Wave Methods in Ion—Atom Collisions

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