ISSN:
0951-4198
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
Utilizing a crosses electron-beam/molecular-beam collision geometry, mass spectra of C60 and C70 ions have been obtained for an electron impact energy range of 20 eV to 600 eV. These spectra are dominated by singly and doubly ionized species. The intensity of fragment ions is very weak, which is in agreement with previous observations. Ionization efficiency curves for the formation of C60+ and C602+ have also been obtained near their threshold regions. From these curves, appearance energies (AE) of these ions have been derived. The AE for C60+ is found to be 7.8±0.3 eV, which agrees well with previous measurements. However, our value of 16.4±0.3 eV for the formation of C602+ is much lower than the value of 19.0±0.3 eV obtained by photo-ionization techniques.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/rcm.1290070711
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