Abstract
A remarkable orbital quadrupole magnetic resonance, so-called twist mode, is predicted in alkali metal clusters where it is represented by low-energy excitations of valence electrons with strong transitions to the ground state. We treat the twist by both macroscopic and microscopic ways. In the latter case, the shell structure of clusters is fully exploited, which is crucial for the considered size region ( ). The energy-weighted sum rule is derived for the pseudo-Hamiltonian. In medium and heavy spherical clusters, the twist dominates over its spin-dipole counterpart and becomes the most strong multipole magnetic mode.
- Received 17 April 2000
DOI:https://doi.org/10.1103/PhysRevLett.85.3141
©2000 American Physical Society