We have been developing multiple coincidence momentum imaging spectroscopy, which consists of electron and ion time-of-flight analyzers with multi-hit two-dimensional position sensitive detectors, a supersonic jet, and a fast TDC system. Figure shows an example of C 1s photoelectron angular distributions (PADs) of CO₂ in a molecular frame measured at a photon energy of 320 eV. CO₂ molecules are oriented parallel or perpendicular to the polarization vector of the incident photon beam. The photoelectrons are ejected from the molecule after scattering by the intra-molecular field and thus the PADs reflect the molecular field, geometry, etc.