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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Experimental and theoretical investigation of excitation cadmium atoms 51P 1 state by electron impact

Mariusz Piwiński, D. Dziczek, Rajesh Srivastava, Stanisław Chwirot

Published Jun 1, 2005• 0 citations
Publisher

Abstract

We present our first experimental results of reduced Stokes parameters and electron impact coherence parameters (EICP) for incident electron energy of 60 eV. The electron-photon coincidence technique has been used in measurements for scattering angles 10° and 15°. The experimental data are compared with theoretical results of relativistic distorted wave approximation calculations.

DOI
10.1117/12.629532

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We present our first experimental results of reduced Stokes parameters and electron impact coherence parameters (EICP) for incident electron energy of 60 eV. The electron-photon coincidence technique has been used in measurements for scattering angles 10° and 15°. The experimental data are compared with theoretical results of relativistic distorted wave approximation calculations.
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.
The coherence analysis technique has been used to determine the state of polarizatitn of 228.8 nm radiation emitted by cadmium atoms excited to 51P1 state by electron impact. Data have been obtained for incident electron energy of 100 eV for scattering angles in the range from 10° to 40°. Reduced Stokes parameters and electron impact coherence parameters (EICP), characterizing the state of the excited atoms immediately after the collision, have been extracted from the measurements and compared with results of relativistic distorted-wave approximation calculations. Theoretical predictions are in good qualitative agreement with experimental values.