Interference effects for intermediate energy electron-impact ionization of H2 and N2 molecules

International Conference on Many Particle Spectroscopy of Atoms, Molecules, Clusters and Surfaces 2014

Ozer, Zehra Nur^1 ; Chaluvadi, Hari^2 ; Madison, Don^2 ; Dogan, Mevlut^1

Department of Physics, E-COL Laboratory, Afyon Kocatepe University, Afyonkarahisar

03200, Turkey^1

Department of Physics, Missouri University of Science and Technology, Rolla

MO, United States^2

关键词: Distorted wave approximations;    Electron impact-ionization;    Electron-electron coincidences;    Interference effects;    Intermediate energies;    Intermediate-energy electrons;    Theoretical calculations;    Two-center interference;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/601/1/012003/pdf
DOI  :  10.1088/1742-6596/601/1/012003

来源: IOP

【 摘 要 】

We have studied electron impact ionization of H2and N2molecules at intermediate energies to look for possible two center interference effects experimentally and theoretically. Here we report a study of the interference factor I for 250 eV electron-impact ionization. The experimental measurements are performed using a crossed-beam-type electron-electron coincidence spectrometer and theoretical calculations are obtained using the Molecular Three Body Distorted Wave Approximation (M3DW). We found that the I-factor demonstrated strong evidence for two-center interference effects for both H2and N2. We also found that the I-factor is more sensitive to projectile angular scans than to ejected electron energy scans which indicate that for the present set of kinematics the diffraction of the projectile from two scattering centers is more important than interference between electron waves emitted from two different centers.