POLARIZATION OF OPTICAL RADIATION INDUCED BY ELECTRON IMPACT ON HELIUM
ARKANSAS UNIV FAYETTEVILLE
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The polarization of the atomic line radiation induced by electron impact on helium was investi gated. Experimental data have been obtained on the polarization of several lines as a function of both electron energgy and pressure. Secondary excitation processes, such as collision of the second kind and radiative transfer cascde, were found to play an important role in the polarization. Expressions are derived for the analysis of the pressure effects on the polar ization. Gas-kinetic collision cross sections involving atoms in excited states have been determined by observing the depolarization as the gas pressure increases.
- Atomic and Molecular Physics and Spectroscopy