Abstract
In this paper we present the results and discuss theapplicability of an impact theory of lineshapes, developed byHenry and Herman for the pressure-induced broadening andshifting of transitions from the ground state to various Rydbergstates of alkalis, to the situation in which the perturbingatoms are ground-state rare gas atoms. This theory, which hassuccessfully described the collisional broadening of Rydbergstates by alkali atoms, can without major alterations predictthe widths and shifts of Doppler-free two-photon transitions tonS and nD states of Rb and Na, 6⩽n⩽30, perturbedby He, Ne, Ar, Kr and Xe. The results in all cases showreasonable agreement with experiment, with the transitions to Na**(nD) states being somewhat less satisfactory than the others.
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