RT info:eu-repo/semantics/article
T1 Coulomb barriers in the dissociation of doubly charged clusters
A1 Garcias, Francesca
A1 Alonso Martín, Julio Alfonso
A1 López Rodríguez, José Manuel
A1 Barranco, Manuel
K1 Física nuclear
AB The barrier height for the most asymmetric fission decay of doubly charged sodium clusters(Na_N^2+) into singly ionized fragments has been computed with use of density-functional theory andthe jellium model. We have found that the barrier is sizable for large or intermediate-size clusters,but vanishes for N<=9. We have also computed the energy DeltaH_e, needed to evaporate a neutralmonomer from Na_N ^2+. For N<=40, the barrier height is smaller than DeltaH_e and emission of a Na^+ion is the preferred decay channel of hot Na_N^2+ clusters. On the other hand, the barrier height islarger than DeltaH_e, for N>40 and, in this case, monomer evaporation becomes competitive. The criticalcluster size, N_c=40, for the transition from one decay mode to the other is in reasonable agreementwith the experimental result. Our calculations suggest that the mechanism for neutralmonomerevaporation is different from the one currently assumed.
PB The American Physical Society
YR 1991
FD 1991
LK http://uvadoc.uva.es/handle/10324/2519
UL http://uvadoc.uva.es/handle/10324/2519
LA eng
NO Physical Review B, v. 43, n. 12, (1991), p. 9459-9466
NO Producción Científica
DS UVaDOC
RD 27-dic-2024