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Journal of Physics B Atomic Molecular and Optical Physics

Electron photon polarization correlation study of the 51P1state of Cd atoms excited by electron impact

M Piwi ski, D. Dziczek, Rajesh Srivastava, Marcin L. Gradziel, Stanisław Chwirot

Published Aug 30, 2002• 12 citations
Publisher

Abstract

Experimental values of the electron impact coherence parameters for excitation of the 5 1 P 1 state of cadmium atoms are reported along with relativistic distorted-wave approximation calculations. The electron–photon coincidence technique has been used in measurements for incident electron energy 100 eV and at scattering angles 10°, 15°, 20°, 30° and 40°. Theoretical results are in good qualitative agreement with experimental data.

DOI
10.1088/0953-4075/35/18/303

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Physical Review A•Dec 1, 1987•6 citations
Experimental values of the electron impact coherence parameters for excitation of the 5 1 P 1 state of cadmium atoms are reported along with relativistic distorted-wave approximation calculations. The electron–photon coincidence technique has been used in measurements for incident electron energy 100 eV and at scattering angles 10°, 15°, 20°, 30° and 40°. Theoretical results are in good qualitative agreement with experimental data.
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.
The delayed coincidence technique was applied to investigate angular and polarization correlations between electrons scattered inelastically from helium atoms and photons emitted in the decay of n1P states. \n \nElectron photon angular correlations were studied for the excitation of the 21P and 31P states of helium at an incident electron energy of 50 eV and for electron scattering angles in the range of 20° - 102° and 35° - 55o respectively. From the analysis of these measurements the excitation parameters λ = (|a¬o| 2)/(2| a1| 2+|ao| 2) = σo/σ and the magnitude |x| of the phase difference between the excitation amplitudes a_ML for the M_L = 1 and M_L = 0 states are obtained. \n \nUsing the 3¬¬1P - 21S decay light the electron-photon polarization correlation were measured for the 31P state of helium at electron impact energies 50, 80, 120 and 160 eV and for electron scattering angles between 27.5° and 108°. The Stokes parameters n1, n2 and n3 were derived and the sign change of the angular momentum transfer < Ly > to the atom was investigated using the circular polarization results (n2). A sign change was confirmed for all energies studied and the scattering angle of the sign change was found to increase with decreasing electron energy. The excitation parameters λ and x have been derived and the present results are compared with theoretical calculations and with previous experimental values obtained from angular and polarization correlation measurements.
Measurements are presented representing a complete set of electron-photon polarization correlation parameters for the excitation of n 1P^{1}P1P states of He at an incident energy of 80 eV and an electron scattering angle of 20\ifmmode^\circ\else\textdegree\fi{}. The data support the predictions of a recent theoretical paper that these parameters should exhibit little variation with n. However, disagreement in absolute values between experiment and theory indicates the need for additional theoretical input into the problem.