Ion Cyclotron Resonance Collision Frequencies of Alkali Ions in Rare Gases
- 1 September 1974
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Physics
- Vol. 52 (17) , 1683-1693
- https://doi.org/10.1139/p74-222
Abstract
An ion cyclotron resonance (ICR) spectrometer was used to estimate collision frequencies of K+ and Na+ ions at near thermal velocities in helium and argon gases. The reduced zero field d.c. drift mobilities were found to be 11.4 and 40.7 cm2 PMU1/2/V s for 39K+ in Ar and He respectively and 11.6 and 42.8 cm2 PMU1/2/V s for Na+ in these gases. The effect of ion-neutral collisions on the energy distribution function for ions at resonance with an oscillating electric field is discussed and the average ionic energy as a function of neutral particle density obtained. In deriving the ICR line shape and ionic energy distribution function it is assumed that the mean time between momentum changing collisions is independent of the relative ion–neutral velocity.Keywords
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