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We report on the {\it Chandra} discovery of large scale non--thermal emissionfeatures in the double lobed SSRL quasar 3C 207 (z=0.684). These are: a diffuseemission well correlated with the western radio lobe, a bright one sided jetwhose structure coincides with that of the eastern radio jet and an X-raysource at the tip of the jet coincident with the hot spot of the eastern lobe.The diffuse X-ray structure is best interpreted as inverse Compton (IC)scattering of the IR photons from the nuclear source and provides directobservational support to an earlier conjecture (Brunetti et al., 1997) that thespectrum of the relativistic electrons in the lobes of radio galaxies extendsto much lower energies than those involved in the synchrotron radio emission.The X-ray luminous and spatially resolved knot along the jet is of particularinterest: by combining VLA and {\it Chandra} data we show that a SSC model isruled out, while the X-ray spectrum and flux can be accounted for by the ICscattering of the CMB photons (EIC) under the assumptions of a relativelystrong boosting and of an energy distribution of the relativistic electrons asthat expected from shock acceleration mechanisms. The X-ray properties of thehot spot are consistent with a SSC model. In all cases we find that theinferred magnetic field strength are lower, but close to the equipartitionvalues. The constraints on the energy distribution of the relativisticelectrons, imposed by the X-ray spectra of the observed features, arediscussed. To this aim we derive in the Appendices precise semi--analyticformulae for the emissivities due to the SSC and EIC processes.Comment: 16 pag. + 13 .PS figures (fig.2 color), Astronomy and Astrophysics,  in pres

Chandradiscovery of extended non-thermal emission in 3C 207 and the spectrum of the relativistic electrons