Temperature effects on the perturber induced shift of dopant ionization energies in He and Ne

In this Letter, temperature effects on the perturber induced shift Δ D ( ρ P ) [ ρ P ≡ perturber number density ] of the dopant ionization energy in the repulsive gases Ne and He are investigated at low to medium perturber number densities (i.e., ρ P ⩽ 6.0 × 10 21 cm - 3 ). We show that these effects arise from changes in the ensemble averaged dopant/perturber polarization energy rather than from changes in the energy of the quasi-free electron.