Electron angular distributions and total cross sections for photoionisation of polarised Ne(3p3D3) atoms near threshold

Abstract

The authors have measured photoelectron angular distributions for resonant two-photon ionisation of metastable Ne(3s ³P₂) via Ne(3p ³D₃) at 0.52 eV photoelectron energy. They derive: (i) the alignment of the Ne(3p ³D₃) state; (ii) the ratio of the reduced matrix elements for the 3p to epsilon d and 3p to epsilon s transitions and (iii) the difference of the phaseshifts in the final channels. For the absolute cross section at 0.52 eV they find (2+or-1)*10^-18 cm². At four different photoelectron energies between threshold and 0.7 eV they have studied the dependence of the total cross section on the angle between the polarising and ionising laser fields. These results are analysed to give the ratio of the above mentioned matrix elements at these energies.