Merged beam study of the associative ionisation ( C + , N + ? and ? O + )+ O - |
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| Authors: | T Nzeyimana EA Naji X Urbain and A Le Padellec |
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| Institution: | (1) Unité FYAM, Département de Physique, Université Catholique de Louvain, chemin du cyclotron 2, 1348 Louvain-La-Neuve, Belgium, BE;(2) LCAR, Université Paul Sabatier-Toulouse III, 118 route de Narbonne, batiment IIIR1b4, 31062 Toulouse Cedex 4, France, FR |
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| Abstract: | Total cross-sections have been measured for the associative ionisation of C
+
+
O
-
, N
+
+
O
-
and O
+
+
O
-
by means of a merged-beam set-up operating with keV beams. These original measurements might be relevant to the understanding
of some astrophysical objects or laboratory-made plasmas (flames and etching plasmas). The magnitude of these cross-sections
is particularly large whatever the associating system, as these are in the range of 1×10
-14
cm2 at thermal energies. Their behaviour as a function of energy significantly differs from one system to another, and is characterised
by the Wigner law at low energy, and a rapid fall-off at higher energy due to competition with non-associative ionisation
processes.
Received 10 December 2001 and Received in final form 12 March 2002 |
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| Keywords: | PACS 82 30 Nr Association addition insertion cluster formation – 31 10 +z Theory of electronic structure electronic transitions and chemical binding – 95 30 Ft Molecular and chemical processes and interactions |
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