Search for doubly charged negative ions of small carbon clusters

A search has been conducted for dianions of small carbon clusters C n 2− (2 ≤ n ≤ 8) formed by laser ablation of graphite. A multicoincidence time-of-flight technique has been used to monitor fragment ion-pairs produced in dianion decay. No evidence is found for C 2 2− dianions. However, detection o...

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Bibliographic Details
Published in:Chemical physics letters 1997-10, Vol.277 (5), p.558-563
Main Authors: Mathur, D., Bhardwaj, V.R., Rajgara, F.A., Safvan, C.P.
Format: Article
Language:English
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Summary:A search has been conducted for dianions of small carbon clusters C n 2− (2 ≤ n ≤ 8) formed by laser ablation of graphite. A multicoincidence time-of-flight technique has been used to monitor fragment ion-pairs produced in dianion decay. No evidence is found for C 2 2− dianions. However, detection of anion-pairs C n −−C n − ( n > 1) provides evidence for higher- n ( n > 2) cluster dianions which exhibit a preference for symmetrical decay. Ab initio computations of potential energy curves have been carried out for C 2 2− dianion states; results indicate too short a lifetime against autodetachment for detection in our experiments.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(97)00915-9