We report a comparative (e, 2e) study of intereference effects in the spherically-averaged electron momentum density distributions of the outermost orbitals of CO2, ethylene and 1,3-butadiene. The experiments on the three molecular orbitals, being each composed of 2p atomic orbitals, were performed in the symmetric noncoplanar geometry and at an incident electron energy of 1.2 keV. Interference patterns have then been obtained for each molecular orbital by dividing the experimental data by (e, 2e) cross section of a 2p atomic orbital calculated by using distorted wave impulse approximation. It is clearly demonstrated that interference patterns tell about constructive or destructive nature of the overlap between the constituent 2p atomic orbitals. Furthermore, it is shown that higher instrumental momentum resolution would be required for detailed studies on interference effects in cases when two of the constituent atomic orbitals with larger spatial separation are both oriented perpendicular to the molecular axis or plane.
|Journal||Journal of Physics B: Atomic, Molecular and Optical Physics|
|Publication status||Published - 2019 May 22|
- Compton scattering
- electron momentum distribution
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics