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Delta-electron emission in fast heavy ion — atom collisions: observations of new phenomena and breakdown of common scaling laws (1992)

Kelbch, C. ; Koch, R. ; Hagmann, S. ; [et al.]

Springer

The European physical journal 22 (1992), S. 713-721

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ISSN: 1434-6079

Keywords: 34.50.Fa ; 34.80.Kw

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract Double differential cross sections for the emission of Delta-electrons have been measured in fast uranium-rare gas collisions. The well-known Binary Encounter peak reveals unexpected structures for certain observation angles and its intensity increases towards smaller angles, which is in contradiction to results and scaling laws obtained by experiments with light ion impact. The observed dependencies are fairly well described by recent calculations in the framework of IA and CTMC. From systematic experimental as well as theoretical studies we can derive that the potential of the partially stripped projectile ion gives rise to rainbow and glory scattering of the target electron in the field of the projectile. The rainbow scattering is observed in the laboratory frame as pronounced interference structures, whereas the glory scattering is responsible for the steep increase of the cross sections for binary-encounter electrons towards small laboratory ejection angles. The observed effects have a dramatic influence on the commonq 2 scaling laws derived from experiments with light ions. Furthermore, since the binary-encounter electrons ejected at forward angles have approximately twice the projectile velocity, these new phenomena have an important influence on the electronic stopping power of heavy ions and therefore have to be taken into account for the investigation of radiation damage by these ions e.g. in biological matter.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01437253

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Abtrennung von Ge-Spuren aus Zinksulfatlösungen mit Hilfe von Polyphenol-Austauscherharzen (1973)

Kraft, G. ; Dosch, H. ; Gabbert, K.

Springer

Fresenius' Zeitschrift für analytische Chemie 267 (1973), S. 106-108

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ISSN: 1618-2650

Keywords: Abtrenn. von Germanium aus Zinksulfatlösungen ; Ionenaustausch ; Polyphenylaustauscher

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Description / Table of Contents: Zusammenfassung Aus Zinksulfatlösungen kann das Germanium mit Hilfe von Polyphenol-Austauscherharzen abgetrennt werden. Als besonders leistungsfähig hat sich ein Pyrogallol-Formaldehyd-Harz erwiesen, das sich durch eine hohe Beladungskapazität von etwa 30 mg/g bei einer Korngröße von 0,2–0,4 mm auszeichnet und das Ge auf Restkonzentrationen 〈20 ng/l zu entfernen und damit eine Ge∶Zn-Relation von mindestens 1∶1010 zu erreichen gestattet.

Notes: Abstract Germanium can be separated from zinc sulphate solutions with the aid of polyphenol exchange resins. Pyrogallol formaldehyde resin has been found particularly efficient on account of its high exchange capacity of about 30 mg/g with a grain size of 0.2–0.4 mm. The resin allows the removal of Ge down to residual concentrations of less than 20 ng/l and thus a Ge∶Zn ratio of at least 1∶1010 can be obtained.