Metastable dissociative decay of fluorofullerene negative ions

• Published in: International journal of mass spectrometry Vol. 303; no. 1; pp. 55 - 62
• Main Authors: Khatymov, Rustem V., Shchukin, Pavel V., Tuktarov, Renat F., Muftakhov, Mars V., Markov, Vitaliy Yu, Goldt, Ilya V.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.05.2011
• Subjects: Autodetachment; Fluorofullerene; Kinetic shift; Metastable negative ion; Resonant electron capture mass spectrometry; RRKM; Metastable negative ion; Resonant electron capture mass spectrometry; Autodetachment; Fluorofullerene; RRKM; Kinetic shift
• ISSN: 1387-3806; 1873-2798
• DOI: 10.1016/j.ijms.2010.12.014

[Display omitted] ▶ Interaction of slow free electrons with fluorofullerene molecules leads to long-lived molecular anions. ▶ Fluorofullerene anions undergo delayed (metastable) fragmentation via detachment of F atoms. ▶ RRKM theory explains experimental observation of temperature dependence and kinetic shift. In the course of the resonant electron capture mass-spectrometric study of the fluorinated fullerenes C 60F 18, C 60F 36 and C 60F 48, the processes of the metastable (slow, delayed) decay of negative ions by loss of fluorine atoms, effectively competing with electron autodetachment were detected. Theoretical analysis of the unimolecular decomposition, carried out on the basis of the statistical RRKM theory, showed that the excess of the appearance energy of fragment ions over the energy threshold results from a kinetic shift. It is shown that rapid processes of fragmentation of fluorofullerene molecular ions take place in addition to a metastable decay.