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Light polarization of mercury 6s6p 1P1 and 6s6p 3P1 resonant transitions excited by electron impact

For the mercury 6s6p 1P1 and 6s6p 3P1 states excited by electron impact, the linear polarization of the light emitted in the transition to the ground state has been measured from threshold to intermediate energy for the decay photons of 254 and 185 nm wavelength, respectively. The results for both lines are in surprisingly good agreement with a calculation based on the Born-Ochkur approximation, neglecting spin-orbit terms for the continuum electron but allowing for electron exchange effects and intermediate coupling.