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Electron impact ionization of fullerenes: Appearance energies of C 70 n + , n = 1, 2 and 3
Author(s) -
Baba Magapu Sai,
Narasimhan Thirupattur S. Lakshmi,
Balasubramanian Rajagopalan,
Mathews Cherian K.
Publication year - 1993
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1290071217
Subject(s) - chemistry , ionization , ion , atomic physics , excited state , electron ionization , ionization energy , extrapolation , electron , fullerene , electron affinity (data page) , molecule , physics , mathematical analysis , mathematics , organic chemistry , quantum mechanics
The ionization efficiency curves for the production of singly, doubly and triply charged ions from C 70 by electron impact are reported, for the first time, up to an electron energy of 80 eV. Appearance energies were derived by linear extrapolation of ionization efficiency curves as 7.8±0.5 eV, 16.0±0.5 eV and 33.0±1.0 eV respectively for C 70 + , C 70 2+and C 70 3+ . The shape of the ionizaiion efficiency curves suggests that there are several energies at which resonant absorption to excited states takes place. Relative abundances of the three ions at various electron energies are also presented. An estimate for the appearance energy of C 70 4+is given.