Coincidence study of excitation of cadmium atoms by electron impact

Abstract

We present experimental values of the electron impact coherence parameters (EICP) and reduced Stokes parameters for excitation of 51P1 state of cadmium atoms. The results have been obtained using electron–photon coincidence technique for incident electron energies 80 eV and 60 eV and electron scattering angles in the range of 5° to 50°. We also present an additional set of data for electron energy 100 eV and scattering angle 50° which complements our previous results. All the experimental values are compared with theoretical relativistic distorted-wave approximation (RDWA) calculations. The first Born approximation (FBA) predictions of the alignment angle are also presented. The theoretical results are in good qualitative agreement with the experimental data.

Peculiar Energy--Scattering Angle Dependence of the Alignment Angle of Atoms Excited by Electron Impact

“…Similar pattern is present in the theoretical data reported for the excitation of Cd atoms (Fig. 4) [6,11,12]. Around the scattering angle of ca.…”

Electron excitation of the41P1state of a zinc atom

“…The presented data for Zn confirm differences in the dependencies of Stokes parameters and EICPs on the scattering angle from those for Cd [17,30]. Dissimilarities are expected based on different spin-orbit-coupling schemes in the atoms.…”

“…The experimental setup used in the present work was essentially the same as the one used in experiments on * Mariusz.Piwinski@fizyka.umk.pl electron-impact excitation of cadmium atoms [14,17]. A diagram of the apparatus is shown in Fig.…”

Electronic excitation of P-state of cadmium and zinc atoms

“…The EICPs determining angular distributions of the electron charge cloud of the excited atoms can be obtained in electron-photon coincidence experiments [6][7][8][9]. However, due to experimental problems and long time consuming measurements there is only a limited number of the experimental data enabling verification of proposed theoretical models [10][11][12]. We will present the values of Stokes and EICP parameters for excitation of the lowest singlet P-state of cadmium and zinc atoms [10,13,14].…”

“…However, due to experimental problems and long time consuming measurements there is only a limited number of the experimental data enabling verification of proposed theoretical models [10][11][12]. We will present the values of Stokes and EICP parameters for excitation of the lowest singlet P-state of cadmium and zinc atoms [10,13,14]. The experiments were performed using electron-photon coincidence technique in the coherence analysis version.…”