Splitting of the giant dipole resonance in deformed metal clusters

The photoabsorption in small deformed metal clusters is considered. The valence electron spill-out is disregarded. It is shown that in the deformed clusters the giant dipole resonance splits into two separate resonances. This splitting is due to the difference of the oscillator frequencies for the electron motion in the effective field of the deformed clusters. The ratio of the cross-sections in the resonance maxima is obtained. The theoretical results are compared with the experimental data.