Abstract
A theory is developed that allows a qualitative explanation andquantitative calculation of the widths and shifts of thetwo-photon Doppler-free transitions from the ground states ofalkali atoms to Rydberg n 2S and n 2D states. Thewidths and shifts result from collisions between Rydberg atomsand ground-state alkali atoms, either of the same or of otherspecies. The collisions are represented by means of apseudopotential that is a function of theoretically calculatedfree-electron elastic scattering resonant and nonresonant phaseshifts, which depend upon the Rydberg electron momentum. Themomentum, in turn, is correlated with the electronic positionwithin the Rydberg atom. This theory assumes classical straight-linetrajectories and takes into consideration themulticollisional nature of the Rydberg-electron-perturbing-atominteraction within the Rydberg atom. Impact theory calculationsof the linewidths and shifts for K**(n S)-K,K**(n S)-Rb, Rb**(n S)-Rb, Rb**(n S)-K, K**(n D)-K, K**(n D)-Rb, Rb**(n D)-Rb and Rb**(n D)-Kshow substantial agreement with experiment for 10⩽n⩽40.
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