Zeitschrift für Physik A Hadrons and nuclei

, Volume 220, Issue 4, pp 337–348

Beweglichkeit von Einfach- und Cluster-Ionen in Argon bei hohen Drucken

  • Iovitzu Popescu
  • Rüdiger von der Heide
Article

DOI: 10.1007/BF01395619

Cite this article as:
Popescu, I. & von der Heide, R. Z. Physik (1969) 220: 337. doi:10.1007/BF01395619

The mobility of simple and cluster ions in argon at high pressures

Abstract

A time-of-flight technique is used for the measurement of positive ion mobilities in argon in the 1–100 atm pressure range at 300 °K. The ions are produced by photoionization of gas atoms in the drift region with ultraviolet light from a spark discharge.

A mobility is found which varies continuously with the reduced electric fieldE/p0 and which exhibits two saturation values at 1.55±0.01 cm2/volt sec (forE/p0≳ 2 volt/cm torr) and at 0.818±0.003 (forE/p0≲ 0.17). The former value is in excellent agreement with the zero-field mobility obtained by Beaty for Ar+. The last value is interpreted in terms of the Langevin theory and connected with the formation of the Ar33+ labile cluster. This has the Ar+ ion as nucleus and is surrounded by two complete shells of 12 and 20 argon atoms respectively. A mean value of the cluster radius is estimated as 6.24 Å.

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Copyright information

© Springer-Verlag 1969

Authors and Affiliations

  • Iovitzu Popescu
    • 1
  • Rüdiger von der Heide
    • 1
  1. 1.Institut für Experimentalphysik der Universität KielDeutschland
  2. 2.Institutul de Fizica al Academiei R. S. RomaniaBukarestRumänien

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