Sai Baba, M. ; LakshmiNarasimhan, T. S. ; Balasubramanian, R. ; Mathews, C. K. (1992) Appearance energy and electron impact ionisation cross-section of C70 International Journal of Mass Spectrometry and Ion Processes, 116 (1). R1-R6. ISSN 0168-1176
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/016811...
Related URL: http://dx.doi.org/10.1016/0168-1176(92)80023-T
Abstract
The electron impact ionisation cross-section of the C70 molecule as well as the appearance potential of the C+70 ion were determined by high temperature mass spectrometry. A molecular beam of C70 effusing from a Knudsen cell was ionised by a beam of 38 eV electrons. The appearance energy was determined by linear extrapolation of the ionisation efficiency curves. By comparing the integral of the ion intensity vs. time curve and the corresponding weight loss from the Knudsen cell for C70 and silver, it was possible to deduce the ionisation cross-section of C70 as (54.5 ± 1.5) × 10-16 cm2. This experimental value is discussed in comparison with those derived using various empirical formulae. The ionisation cross-section of C70 is very nearly the same as that for C60.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Appearance Energy; Cross-section; Knudsen Cell |
| ID Code: | 25258 |
| Deposited On: | 06 Dec 2010 13:40 |
| Last Modified: | 06 Jun 2011 11:29 |
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