Abstract
Field ionization of high- n CH 3I Rydberg states doped into argon is presented as a function of argon number density along the critical isotherm. These data exhibit a decrease in the argon induced shift of the dopant ionization energy near the critical point. We show that this decrease is due to the interaction between argon and the quasi-free electron arising from field ionization of the dopant. The energy of the quasi-free electron in argon near the critical point is calculated in a local Wigner–Seitz model containing no adjustable parameters to within ±0.2% of experiment.
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