Photodouble ionization of helium at an excess energy of 40 eV

摘要: Angular correlation in the two-electron continuum of He double photoionization has been studied, both experimentally and theoretically, for equal unequal energy sharing conditions at photon 40 eV above threshold. The triple differential cross sections have measured plane perpendicular to direction using multi-coincidence detection technique Reddish et al Daresbury Synchrotron Radiation Source. Recent modifications bending-magnet beam line allowed an effective cancellation circular polarization target, leaving a relatively high degree linear (Stokes parameters: S 3 = 2 0, 1 0.8). are compared with calculations 3C method Maulbetsch Briggs convergent close coupling Kheifets Bray. Good agreement between theory experiment found most cases, except when one escaping electrons is detected axis.