Zimmermann, HenriEilzer, SebastianEichmann, Ulli2022-03-092022-03-0920151742-6588https://depositonce.tu-berlin.de/handle/11303/16527http://dx.doi.org/10.14279/depositonce-15304We investigated the principal quantum number n distribution of excited states resulting from the interaction of Helium with strong, short laser pulses. We find excellent agreement with predictions of the semiclassical frustrated tunneling ionization (FTI) model [1] as well as fully quantum mechanical calculations. Furthermore, the excitation process directly populates triplet excited states due to the breakdown of the Russel-Saunders coupling scheme for high orbital angular momentum l states of Helium, which are predominantly populated in the strong laser field.en530 Physikneutral Heliumspin-effectsstrong-field excitationexcited state distributionprincipal quantum number nArticle2022-03-061742-6596