Orientation effect in Ar dimer fragmentation by highly charged ion impact
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS(2018)
摘要
The fragmentation experiment on doubly and triply ionized Ar dimers is carried out using 1.0 MeV Ne8+ impact, focusing on the angular distribution of Ar+ and Ar2+ ions. For the fragmentation of (Ar-2)(2+), one-site double ionization and two-site double ionization are distinguished clearly, and different angular distributions are observed for these two channels. This phenomenon is explained qualitatively in simple geometrical considerations. For the fragmentation of (Ar-2)(3+), we find that the Ar+ ions tend to fly along the projectile direction, while the doubly charged Ar2+ ions tend to fly in the opposite direction. This result suggests that, to form the parent ion (Ar-2)(3+), transfer ionization is favorable in the first collision step, while single ionization is dominant in the second collision step.
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关键词
orientation effect,fragmentation mechanism,Ar dimer,highly charged ions,reaction microscope
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