2021-03-05T14:33:51Zhttp://uvadoc.uva.es/oai/requestoai:uvadoc.uva.es:10324/25192020-05-15T10:25:27Zcom_10324_1159com_10324_931com_10324_894col_10324_1310
00925njm 22002777a 4500
dc
Garcias, Francesca
author
Alonso Martín, Julio Alfonso
author
López Rodríguez, José Manuel
author
Barranco, Manuel
author
1991
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 and
the 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 neutral
monomer 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 is
larger than DeltaH_e, for N>40 and, in this case, monomer evaporation becomes competitive. The critical
cluster size, N_c=40, for the transition from one decay mode to the other is in reasonable agreement
with the experimental result. Our calculations suggest that the mechanism for neutralmonomer
evaporation is different from the one currently assumed.
Physical Review B, v. 43, n. 12, (1991), p. 9459-9466
http://uvadoc.uva.es/handle/10324/2519
10.1103/PhysRevB.43.9459
9459
12
9466
Physical Review B
43
Física nuclear
Coulomb barriers in the dissociation of doubly charged clusters