Atomic and molecular impurities in4He clusters |
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Authors: | F Dalfovo |
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Institution: | 1. Cyclotron Institute, Texas A&M University, 77843, College Station, TX, USA 2. EG&G Energy Measurements, Andrews Air Force Base, 20335, Washington D.C., WA, USA 3. Department of Physics, Texas A&M University, 77843, College Station, TX, USA
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Abstract: | Recoil-ion charge distributions produced in single collisions of 8 MeV/u Kr13+ and Kr32+ projectiles with Xe atoms have been measured using time-of-flight spectroscopy. The post-collision charge states of the projectile ions were determined by magnetic dispersion onto a position sensitive microchannel plate detector. The recoil-ion distributions for ionization accompanied by electron loss from Kr13+ projectiles were bell-shaped with averages that ranged from 7.4 for 1-electron loss to 13.9 for 5-electron loss. The recoil-ion distributions for ionization accompanied by electron capture to Kr32+ projectiles were also bell-shaped, but had much higher average charges that ranged from 20.4 for 1-electron capture to 28.5 for 4-electron capture. The large difference in the average charges produced in the two types of collisions is mainly attributable to charge magnification by Auger decay. A simple model quantitatively explains the variation of the capture-ionization charge distribution width and average charge as a function of the number of captured electrons. |
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