Swarm study of Kr[sup 2+] ions in helium gas at very low temperature

Tanuma, Hajime; Hidaka, Hiroshi; Kobayashi, Nobuo
February 2000
AIP Conference Proceedings;2000, Vol. 500 Issue 1, p699
Academic Journal
Doubly charged helium cluster ions Kr2+-Hen (n≤40) have been produced when Kr[sup 2+] ions are injected into helium gas cooled by liquid helium. Magic numbers n=12 and 32 have been observed in the size distribution of these cluster ions. These magic numbers suggest the shell structure in which an icosahedron consisting of twelve helium atoms performs as a core in the cluster ion. Not only the clustering, charge transfer between Kr[sup 2+] and He also takes place as a competitive reaction of the cluster formation. Behavior of each electronic states of the incident ions in collisions with helium have been discussed on a crude potential crossing model. © 2000 American Institute of Physics.


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