Fig. 3

Illustration of angular distributions at different photon energies. Experimentally (a–c) and theoretically (d–f) derived PADs at three exemplary photon energies, below (a, d), in (b, e), and above (c, f) the Cooper minimum of Ar⁺ photoionization based on the results presented in Fig. 2. b is identical to the inset in Fig. 1 for better orientation. For this case of maximum asymmetry, the experimental PAD is compared to theoretical PADs (e) for the cases of including and disregarding the γ₂ contribution. The latter corresponds to the dipole approximation without asymmetric contributions