The collisional broadening cross sections of potassium with the rare gases He, Ne and Ar were measured, using a new absorption-polarization method, which involves the Faraday rotation near an atomic resonance. These cross sections above and below the resonance transitions 4S1/2-4P1/2,3/2 show an asymmetry of the broadenings. The interaction time of the potassium-rare gas pair was found to increase from 0.3 ps for He to 1.3 ps for Ar.
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