Abstract
The linear and circular polarization of the K(42P → 42S) photons detected in delayed coincidence with the inelastically scattered potassium atom is presented for K-He, K-Ne, and K-Ar collisions as a function of the projectile scattering angle. The Stokes parameter analysis reveals that for K-Ar the collisionally excited state is not a pure state. It is concluded that two processes, single excitation of the potassium atom and simultaneous excitation of the potassium and argon atom, lead to K(42P) excitation. For K-He and K-Ne the excited state is a pure state; in both cases λ and χ parameters are derived from the measured Stokes parameters. Simple models for the excitation process are discussed in order to explain the dependence of χ on the impact parameter.
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