Unique information about the motion and correlation of valence electrons in atoms, molecules and their ions is obtained from electron-impact ionization reactions near the Bethe ridge at total energies of the order of 1000 eV or higher. This is electron momentum spectroscopy. The history, theory and practice of the field are discussed and its value is shown by numerous examples.

https://iopscience.iop.org/article/10.1088/0034-4885/54/6/001/pdf

Electron momentum spectroscopy of atoms and molecules

Elastic electron scattering from 12c and 16o.

(e, 2e) spectroscopy

Electron scattering by nuclei

Longitudinal and transverse responses in quasi-elastic electron scattering from 208Pb and 4He

In a recent paper (~) it was shown that there were difficulties in interpreting in a unified way the elastic (2) and quasi-free (a) electron scattering data from carbon by using the phenomenological spherical shell model (*). In fact, i t was impossible to obtain a set of single-particle wave function parameters which fitted both the elastic and quasifree scattering data. In paper (~) it was suggested that this result could probably be changed by considering the possible distortion of the single-particle wave functions by the short-range dynamical correlations arising from repulsive cores. One expects these correlations to have their grea%est effect on the high-momentum components of the single-particle wave functions, and consequently it is reasonable to assume that the elastic form factor, where one measures high-momentum components, will be very sensitive to these correlations. The recent results on 4He (4), and the consequent a t tempts to explain them (5), seem to confirm this hypothesis. The introduction of correlations has proved to be useful also in computing the electron elastic form factor of the eLi nucleus (5~). First results are presented in this note which show tha t if one computes the elast ic form factor with correlated wave functions, one obtains oscillator parameters similar to those given by the (o, e'p) reaction, that is sensibly state-dependent. The correlations were treated in the usual Jastrow method (6), so that the nuclear

Short-range dynamical correlations in the12C nucleus from elastic electron scattering

Elastic and quasi-free electron scattering from 12C and projected Hartree-Fock wave functions

Antisymmetry and orthogonality effects in single-particle models of (γ, p) reactions are formally discussed and numerical calculations for the reaction16O(γ, p)15N are presented

Antisymmetry and orthogonality effects in single-particle models of (γ, p) reactions

Single-particle wave functions of the 12C nucleus from elastic and quasi-free electron scattering

y-scaling in quasi-elastic electron scattering from nuclei is discussed paying particular attention to the question of the definition of the scaling variable. By analysing recent experimental data on12C, it is shown that the scaling functionF(y) should be defined in terms of a new scaling variabley1 which takes explicitly into account the effects from finite nuclear masses and nucleon binding; in the asymptotic limity1 goes over into the usual scaling variabley0=Mω/q−q/2. Some open problems concerningy-scaling in3He are also discussed.

C. Ciofi Degli Atti

Papers

Short-range dynamical correlations in the12C nucleus from elastic electron scattering

Elastic and quasi-free electron scattering from 12C and projected Hartree-Fock wave functions

Antisymmetry and orthogonality effects in single-particle models of (γ, p) reactions

Single-particle wave functions of the 12C nucleus from elastic and quasi-free electron scattering

y-Scaling in quasi-elastic electron scattering by nuclei