  In the last decade, a growing interest has been devoted to models of
spontaneous collapse of the wavefunction, known also as collapse models. They
coherently solve the well-known quantum measurement problem by suitably
modifying the Schr\"odinger evolution. Quantum experiments are now finally
within the reach of testing such models (and thus testing the limits of quantum
theory). Here, we propose a method based on a two-ions confined in a linear
Paul trap to possibly enhance the testing capabilities of such experiments. The
combination of an atomic and a macromolecular ion provide a good match for the
cooling of the motional degrees of freedom and a non-negligible insight in the
collapse mechanism, respectively.
