Compton scattering study of ZnSe

Abstract

In this work we report on the Compton scattering study of ZnSe. The Am 241 Compton spectrometer, which uses 59.54 keV gamma rays, has been used for the measurements. The data has been compared with the ionic model based calculations for various Zn +x Se -x configurations (x varying from 0 to 2) and also with the Compton profiles computed from the local and non-local empirical pseudopotential methods. Although, the agreement is better with the local empirical pseudopotential calculation compared to the non-local method, the best agreement has been found with the ionic model for Zn +2 Se-2 configuration suggesting that the bonding in this compound is mainly ionic in nature.

Electron Momentum Density and Phase Transition in ZnS

“…In Figure 3, we plot the experimental EVED profiles of the two compounds deduced from experimental valence (experiment-convoluted core). For ZnSe, data is taken from our own earlier measurement [50]. The EVED profiles were derived by normalizing valence electron profiles to 4.0 electrons and scaling the resulting profiles by the Fermi momentum ( ).…”

Electron momentum density in zinc oxide

“…To obtain EVED profiles we have considered only the experimental valence Compton profiles of the three compounds. The experimental Compton profile of ZnS is taken from the work of Panda and Padhi [28], whereas our earlier measurement [15] is used for ZnSe. The figure depicts that the EVED profile corresponding to ZnS is largest in the low-momentum region followed by ZnSe and ZnO.…”

“…To our knowledge, no attempt has been made to study electron momentum density distribution in ZnO. However, recently Vyas and coworkers [15] have reported the Compton profile of ZnSe and suggested for a better treatment of the Zn (3d) electrons in the pseudopotential. In continuation of our endeavor to work on zinc compounds, here we report on the Compton profile study of ZnO both experimentally and theoretically.…”

Electron momentum distribution in SnS

“…Both these curves together with the experiment show a dip at 6 a.u., indicating larger correlation. Unlike ZnSe [39], which is ionic in nature, the dip is pronounced and clearly visible, implying that bonding is dominated by the nearest-neighbor interaction and overlap. As the dip is missing in the B(z) function corresponding to the ionic model derived from the free-atom arrangement it suggests that crystalline effects are largely responsible for bonding in the solid.…”