Abstract
The energy V0 of the quasi-free electron state in liquid argon is calculated as a function of the number density n in the range (0.001 ÷ 0.021) Å-3. In the calculation, Lekner's theory for the scattering of excess electrons in liquid argon is followed, but modern, first-principles pseudopotentials are used. By comparing to experiment, it is shown that our results correctly describe not only the order of magnitude of V0(n), but also the shape of the curve, which shows a minimum at n = 1.2 · 1022 atoms/cm3. These new results are in much closer agreement with experimental data than other existing calculations.