Atomic collision studies at moderate projectile velocities using highly charged, decelerated heavy ions from the GSI-UNILAC

Mokler, P. H.; Hoffmann, D. H. H.; Schonfeldt, W A; Maor, D.; Meyerhof, W. E.; Stachura, Z.

doi:10.1016/0168-583x(84)90040-5

Cited by 17 publications

(4 citation statements)

References 12 publications

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“…The standard technique today is the acceleration-deceleration method [11] which is limited to projectiles of Z lower than 40 at running accelerator facilities. The standard technique today is the acceleration-deceleration method [11] which is limited to projectiles of Z lower than 40 at running accelerator facilities.…”

Section: Introductionmentioning

confidence: 99%

Search for interference structures in the quasimolecular X-ray-andK-vacancy production in close collisions of 462 MeV hydrogen-like Kr ions on Mo solid targets

Wintermeyer

Dangendorf

Schmidt‐Böcking

et al. 1990

Z Phys D - Atoms, Molecules and Clusters

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The impact parameter dependence of the emission of quasimolecular radiation and of quasiresonant K -K transfer has been investigated for collisions of 462 MeV Kr 35+-Mo solid target. The results are compared with calculations based on the MO model for the radiative decay of 1 so. vacancies and nonradiative couplings of the 1so-and 2pa level. The data are discussed with special emphasis of the influence of the solid target. Furthermore the possible influence of nuclear reactions on the MO-spectrum is considered.

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Section: Introductionmentioning

confidence: 99%

Search for interference structures in the quasimolecular X-ray-andK-vacancy production in close collisions of 462 MeV hydrogen-like Kr ions on Mo solid targets

Wintermeyer

Dangendorf

Schmidt‐Böcking

et al. 1990

Z Phys D - Atoms, Molecules and Clusters

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“…Hence, several attempts have been made to circumvent this problem. The spectroscopy of slow highly-charged recoil ions [3] is limited both in Z as well as by the presence of spectator electrons; the acceldecel technique [4] seems to be the ultimate solution for precision spectroscopy and has been applied first for S-ions [-5]. However, in-beam calibration (using e.g.…”

mentioning

confidence: 99%

“…The hydrogenic projectiles were produced by stripping at 11.4 MeV/u and then decelerating [4], prior to magnetic charge state selection and narrow directional collimation, performed in front of the gas target. The open gas target was a triply differentially pumped cell, where the central 7.5 mm long region was viewed by two opposite-facing Si(Li)-detectors mounted perpendicular to the beam direction (the energy resolution of both detectors was 250 eV at 5.9 keV).…”

mentioning

confidence: 99%

Radiative electron capture: a tool for structure studies of heavy few-electron ions

Mokler

Stöhlker

Kozhuharov

et al. 1991

Z Phys D - Atoms, Molecules and Clusters

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Abstract. Radiative Electron Capture (REC) in collisions of hydrogenic germanium ions with hydrogen is measured for projectile energies between 4 and 12 MeV/u. Extrapolating the resulting centroid energies of the K-REC radiation to zero collision velocity the K-binding energy in helium-like germanium-ions is determined. The value compares well with the theoretical prediction. REC in atomic collisions is advertised as a spectroscopic tool for structure investigations of very heavy few-electron projectiles. PACS" 32.30.Rj; 34.70.+e With the advent of the new generation of heavy-ion accelerators, in particular storage ring facilities, a precise determination of the spectroscopic structure of heavy few-electron ions seems to be feasible even for the heaviest species. This is one of the very challenging aspects in accelerator based atomic physics [1]. Various methods for precision spectroscopy have been proposed and applied, for a survey see e.g. [2]. For spectroscopy with fast beams the Doppler effect is the limiting factor for the accuracy. Hence, several attempts have been made to circumvent this problem. The spectroscopy of slow highly-charged recoil ions [3] is limited both in Z as well as by the presence of spectator electrons; the acceldecel technique [4] seems to be the ultimate solution for precision spectroscopy and has been applied first for S-ions [-5]. However, in-beam calibration (using e.g. Lyman-e/Balmer-fl inter-comparison [6]) or Dopplertuned spectroscopy applying absorber techniques [-7, 8] are also promising methods. All the methods mentioned measure the transition energy between bound states.Radiative Electron Capture (REC) [-9, 10] in contrast gives the transition energy between a free (or a quasi-free) electron in the continuum and a bound state of the ion * Dedicated to Prof. Dr. R Armbruster on the occasion of his 60th birthday [11]. Thus, by knowing the kinetic energy of the electron to be captured with respect to the ion, one can determine the total binding energy for the added electron. Based on this knowledge it is tempting to measure for this purpose REC-radiation from the merged beams region in electron cooler devices [-12]. However, geometry and background radiation do not facilitate this task; additionally the macro and micro structure of the merged beams region have to be known in detail and the Doppler effect could still be a limiting factor for precision measurements. If quasi-free instead of free target electrons (i.e. electrons slightly bound in light target atoms) are used, the width of the REC-transition energy is increased due to the atomic confinement of the electrons, their momentum distribution being characterized by the Compton profile.With a first pilot experiment we will show in this communication that despite the inherent width of the REC-peak in an ion light-atom collision, the centroid of the REC-radiation can be used to determine inner shell binding energies for heavy projectiles with high accuracy.The REC-radiation from hydrogenic Ge 31 ÷ ions, colliding with m...

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“…For the observation of at least one or more oscillations in the MOR emission probabilities, H-like projectiles are needed with velocities v p s 0.2 v'i A where v'i A is the K electron velocity in the united atom (UA) system. Since presently no ion sources for H-like ions (Zp~16) with sufficient intensity in combination with suitable accelerators are available, the only way to produce such beams is the so-called accel-stripping-decel technique [10][11][12]. Ions are accelerated to such high velocities that the penetration of a thin C-foil produces a considerable fraction of one-electron ions (H-iike).…”

mentioning

confidence: 99%

Spectroscopy of quasimolecular X-rays with H-like decelerated ions

Schmidt‐Böcking

Schuch

Tserruya

et al. 1985

Nuclear Instruments and Methods in Physics Research Section B:

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Atomic collision studies at moderate projectile velocities using highly charged, decelerated heavy ions from the GSI-UNILAC

Cited by 17 publications

References 12 publications

Search for interference structures in the quasimolecular X-ray-andK-vacancy production in close collisions of 462 MeV hydrogen-like Kr ions on Mo solid targets

Search for interference structures in the quasimolecular X-ray-andK-vacancy production in close collisions of 462 MeV hydrogen-like Kr ions on Mo solid targets

Radiative electron capture: a tool for structure studies of heavy few-electron ions

Spectroscopy of quasimolecular X-rays with H-like decelerated ions

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