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Polarization of electron-impact light from helium

J. H. Whitteker, F. W. Dalby

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Abstract

The polarization of electron-impact light from helium has been measured for the multiplets 2 3P–2 3S (10 829 Å) and 3 3P–2 3S (3889 Å) for electron energies in the range from threshold to 50 eV. For the 2 3P–2 3S multiplet, the observed polarization rises to 21% near threshold and by means of a curve fitting procedure may be extrapolated to (32 ± 6)% at threshold. For the 3 3P–2 3S multiplet, the observed polarization rises to 11% and may be extrapolated to (15 + 3)%.

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The polarization of electron-impact light from helium has been measured for the multiplets 2 3P–2 3S (10 829 Å) and 3 3P–2 3S (3889 Å) for electron energies in the range from threshold to 50 eV. For the 2 3P–2 3S multiplet, the observed polarization rises to 21% near threshold and by means of a curve fitting procedure may be extrapolated to (32 ± 6)% at threshold. For the 3 3P–2 3S multiplet, the observed polarization rises to 11% and may be extrapolated to (15 + 3)%.

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Available abstract

The polarization of electron-impact light from helium has been measured for the multiplets 2 3P–2 3S (10 829 Å) and 3 3P–2 3S (3889 Å) for electron energies in the range from threshold to 50 eV. For the 2 3P–2 3S multiplet, the observed polarization rises to 21% near threshold and by means of a curve fitting procedure may be extrapolated to (32 ± 6)% at threshold. For the 3 3P–2 3S multiplet, the observed polarization rises to 11% and may be extrapolated to (15 + 3)%.

Key concepts: Physics, Multiplet, Atomic physics, Polarization (electrochemistry), Helium, Electron, Spectral line, Nuclear physics

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