[en] We report results of studies of diffractive dissociation of high energy pions that provide information on the internal wave function of the x meson. These are analogous to studies of Coulomb dissociation of accelerated molecules which provided information about their structure. The qq pair fragment, after the dissociation into two jets which carry the momentum of the qq pair. By detecting the jets and measuring their momentum we can determine the momentum wave function of the qq pair in the pion. For Q² values near 10 (GeV/c)² the asymptotic wave function describes well the measured one. The small dimensions of the pion at these Q² values allows tests of predicted color transparency effects