Carbon anions and dianion clusters

[摘要] The techniques and equipment developed for AMS studies are well suited for identifying exotic negative ions. On learning that double-negative ions consisting of clusters of seven or more carbon atoms were tentatively identified using conventional mass spectrometry, we decided to use the AMS system at the University of Pennsylvania to incontrovertibly confirm the existence of these molecular dianions. Also Coulomb explosion studies have been made in the terminal of our tandem using carbon foils preceding Lexan track detectors to shed light on their structure, Similar, but preliminary searches for polyatomic dianions of Li, B, and Si were unsuccessful. We have also studied the polyatomic anions of several light elements of general interest to the AMS community and, for example, were surprised to observe N-14(2)-, and N-14(3)- ions to be stable or to have lifetimes > 10 mu s.

[发布日期] 1997-03-01

[效力级别]  Proceedings Paper