Observations of triple coincidence polarization correlations of the sequential cascading photons (667.8 nm 31D → 21P and 58.4 nm 21P → 1S transitions) and the scattered electrons from electron impact excitation of the 31D state of helium have determined the amplitudes and relative phases of the magnetic substates. The ambiguity of electron-photon coincidence measurements, which determine only the cosine of the sum of the phases between the m = ±2 amplitudes, is resolved. The measured amplitudes and phases at 60 eV incident energy and 40° scattering angle confirm the convergent close coupling values.
|Number of pages||4|
|Journal||Physical Review Letters|
|Publication status||Published - 3 Nov 1997|