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An experimental technique is described which enables determination of the partial cross sections for electron excitation of atoms as a function of changes in spin and orbital angular momentum. This method provides a good signal-to-noise ratio in the energy region near threshold, and could be used to study long- or short-lived excited states of many atomic systems. Measurements for Na 3s-3p, near-threshold excitation are reported here. The results are generally in good agreement with the close-coupling calculations of D. L. Moores and D. W. Norcross (J. Phys. B 5, 1482 (1972)) for the largest ..delta..m/sub S/ and ..delta..m/sub L/ components of the cross section, but not for the component with chemically bond..delta..m/sub S/chemically bond = 1 and chemically bond..delta..m/sub L/chemically bond = 1, indicating that the exchange interaction is larger than previously recognized.

physical review. a, general physics

Spin-exchange cross section for electron excitation of Na<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>3</mml:mn><mml:mi>S</mml:mi><mml:mo>−</mml:mo><mml:mn>3</mml:mn><mml:mi>P</mml:mi></mml:math>determined by a novel spectroscopic technique

Spin-exchange cross section for electron excitation of Na3S−3Pdetermined by a novel spectroscopic technique