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Journal of Physics B Atomic Molecular and Optical Physics

Coherence and correlation in electron impact autoionisation of neon and argon

J P van den Brink, Peter N. den Outer, J. van Eck, H G M Heideman

Published Jul 14, 1990• 14 citations
Publisher

Abstract

The authors present experimental data on the autoionisation of neon and argon excited by electron impact. The energy of the incident electrons is chosen such that the two outgoing electrons in the final state have comparable energies. In this energy region state-state coherences and post-collision interactions (PCI) between the two electrons may be observed. Examples of observations of state-state interferences are presented and the effect of PCI in these experiments is discussed. A detailed analysis of the measurements is complicated due to the presence of overlapping neighbouring states.

DOI
10.1088/0953-4075/23/13/024

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The authors present experimental data on the autoionisation of neon and argon excited by electron impact. The energy of the incident electrons is chosen such that the two outgoing electrons in the final state have comparable energies. In this energy region state-state coherences and post-collision interactions (PCI) between the two electrons may be observed. Examples of observations of state-state interferences are presented and the effect of PCI in these experiments is discussed. A detailed analysis of the measurements is complicated due to the presence of overlapping neighbouring states.
The resonant double photoionization of Ne has been studied via an electron-electron coincidence experiment. A complete set of measurements was performed at different mutual angles when the photoelectron and Auger-electron pairs have nearly equal energy. The overall experimental energy resolution, narrower than the natural linewidth of the intermediate state, has allowed us to observe interference effects due to the indistinguishability of the two electrons. The observed energy and angular distribution exhibit a strong interplay of postcollisional interaction and interference effects. Calculations based on the model developed by Sheinerman and Schmidt [J. Phys. B 30, 1677 (1997)] describe the main trend of the experimental observations.
The results of electron-photon coincidence experiments have given a new insight into the excitation of atoms by electron impact. This article reviews the way in which this new experimental technique has provided an exacting and fundamental test for the theory of the excitation process. The basic experimental method is first described, and a comprehensive treatment of excitation of the n 1 P states of helium is given. The extension of the technique to the study of excitation of the n=2 states of atomic hydrogen is then presented. Coincidence measurements also provide information on the role of spin in the collision, and this subject is treated in detail for excitation of heavy atoms by both unpolarised and spin-polarised beams of electrons. Finally, the electron-photon coincidence method permits observation of the time evolution of excited atomic states, and this review describes the attempts made to observe quantum beats in the radiative decay.
Abstract: In recent experiments we have shown both in electron impact and in photoionisa-tion studies the possibility to determine coherences between the excitation of states of different energies. In this paper the consequences of applying coincident techniques to these experiments are discussed. In a coincidence experiment one has to choose, however, for lower energy resolu-tions in order to reach sufficient count rates. We present an experiment which shows that these lower resolutions do not totally obscure the formerly observed interference effects, thus proving the feasibility of a future coincidence experiment. 1