https://doi.org/10.1140/epjd/e20020036
Anharmonic effects in large-amplitude vibrations of metal clusters
1
Institute of Physics, St.Petersburg University, 198904 St.Petersburg, Russia
2
Universidade de Coimbra, Departamento de Fisica, 3000 Coimbra, Portugal
Corresponding author: a providencia@malaposta.fis.uc.pt
Received:
26
April
2001
Revised:
15
October
2001
Published online: 15 March 2002
Two types of extreme collective motion, large-amplitude many-phonon vibration of the ionic core and rotation of the cluster with high angular momenta, are considered. The interplay between vibration and collective motion towards fission is discussed. A new mechanism of formation and rupture of the neck is proposed which is based on the Franck-Condon principle, and accounts for the interplay between vibration and fission. Under rotation, the change of the shape of the cluster and a phase transition from axially symmetric to triaxial ellipsoid are predicted. For studying the effects, vibrational motion can be induced by laser radiation. Rotational motion may arise in collisions of clusters.
PACS: 36.40.-c – Atomic and molecular clusters / 36.40.Ei – Phase transitions in clusters
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002
