The complete valence-shell electron separation-energy spectra and momentum distributions are measured for 1,2-propadiene by high momentum-resolution electron-momentum spectroscopy at a total energy of 1500 eV. Many-body calculations of the separation energies and spectroscopic factors using Green function methods are carried out and, for the binding energies, compared with the experimental data. The measured momentum distributions are compared with those calculated in the plane-wave impulse approximation (PWIA) formalism using two respective SCF orbital wavefunctions, the second of which includes d-functions in the basis set. The agreement between the measured momentum distributions and the PWIA-SCF orbital-momentum distributions is, in general, fair, although for the outermost orbitals the SCF wavefunctions underestimate the density at low momentum. The inner valence 1b2 and 1a1 orbitals are found to be severely split by final-state correlation effects.

We repon results for the first electron momentum specmcopy (EMS) investigation into the 4d5/2,3/2 core states of xenon. Experimental binding energy spedra were measured over the momentum range from 0.3 to 1.9 au with the derived 4d m s s section demonstrating the superiority of a distoed wave Eom approximation (DWBA) calculdion over the companding plane wave Eom a p p r o x i d o n (PWBA) calculation. The present result also indicated that the xenon Hamee-Fock (w) wavefunction may be inadequate, in that in its representation of the 4d ohital it was found to be not sufficiently diffuse in cwrdinate space.

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Momentum distributionsand spectroscopic factors are obtained in a high-resolution electronmomentum spectroscopy study of xenon at 1000 eV. The shapes and relative magnitudes of the momentum profiles are in excellent agreement with distorted-wave (DW) impulse approximations using the target Dirac-Fock (DF) approximation. The DWDF approximation accurately describes the relative magnitudes of the 5p and 5s manifold cross sections as well as the shape of the 5s cross section. The use of nonrelativistic Hartree-Fock wave functions gives significantly poorer fits to the data. Spectroscopic factors for transitions belonging to the 'S&/2 PJ/2 3/2 and 'D3/2 5/2 manifolds are assigned up to a separation energy of 45 eV. The spectroscopic strength for the lowest 5s transition is 0.345+0.010 whereas that for the ground-state 5p transition is 0.96+0.02. The 5s strength in the continuum above 33.1 eV is 0. 115+0.025 and that for the 5p manifold is only 0.03+0.01. The first momentum profiles belonging to excited P' and D' manifolds are obtained. The latter, which must be entirely due to d-wave correlations in the xenon ground state, are in good agreement with DF 5d momentum profiles. Comparison is made with several many-body calculations and agreement with the latest relativistic calculation is good.PACS number(s): 34.80.Dp, 35.10.Hn, 31.20.Tz

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