A theoretical study of internal rearrangements and open channels for fission and mass exchanges in Xe
n
+
clusters |
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Authors: | M Amarouche G Durand J P Malrieu |
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Institution: | 1. Laboratorie de Physique Quantique, Unité Associée no 505 du CNRS, Université Paul Sabatier, 118, Route de Narbonne, F-31062, Toulouse Cedex, France 2. Université de Tizi-Ouzou, Algeria
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Abstract: | In a previous work the equilibrium geometrical and electronic structures of Xe n + clusters had been established using a non-empirical model hamiltonian. The same model is used to determine the energetic barriers between the nearly degenerate isomers; the movement of the neutral atoms around the Xe 3 + or Xe 4 + ionized linear cores are quite easy (ΔE?0.9 kcal/mole), the changes from a Xe 3 + to a Xe 4 + core are more difficult (ΔE?2.0 kcal/mole). The energetically possible fissions from a vertical photoionization \(Xe_n \xrightarrow{{h v}}Xe_n^{v + } \to Xe_p^ + + Xe_{n - p} \) forn≦19,p=1–9 and 12–14 and mass exchanges Xe p + +Xe q →Xe p+m + +Xe q?m (m=1,2,3) from relaxed Xe p + clusters are given forp+m≦9 and 12–14 andq≦19. Surprisingly the reverse reactions are shown to occur for some values ofp andq. Numerous processes lead to Xe 13 + , which is especially stable. |
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