behaviour that can also exhibit an erratic pattern and chaos we used the Fourier transform of the analyzed signals:

$$x\left( \omega \right) = \lim_{T\rightarrow \infty} \int^{T}_{0} e^{i\omega t} \cdot x\left( t\right) \ dt\ ,$$

$$x\left( \omega \right) = \lim_{N\rightarrow \infty} \sum^{N}_{n=0} e^{i\omega t_{n}} \cdot x\left( t_{n}\right).$$

For a multiple periodical movement the power spectrum:

$$P\left( \omega \right) = \left|x\left( \omega \right)\right|^{2},$$

will only contain a number of discrete lines: the fundamental frequencies of the system and their associated sets of harmonics, while the chaotical behaviour is completely aperiodical and is represented by a continuous or quasi-continuous broadband.

The obtained results are presented in Figures \[fig:4\]-\[fig:7\]. As a persistent feature of the physical system analyzed one should mention that for the monopole and dipole deformation degrees of the potential well (Figures \[fig:5\] and \[fig:6\]) the chaotic behaviour increases in time, thus confirming previous results.

The transition towards a chaotic regime was put again in evidence once passing from the adiabatic to the resonance stage of the interaction. The power spectra reveal, as expected, the intermittent feature of the transition in the monopolar case at $\Omega=0.1\ c/\rm{fm}$.

This can be detected for periods of time large enough ($\Delta t \geq 1,600\ \rm{fm}/c$) 