SAMOP 2023 – scientific programme

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MO: Fachverband Molekülphysik

MO 9: Molecules in Intense Fields and Quantum Control (joint session MO/A)

MO 9.4: Talk

Wednesday, March 8, 2023, 15:30–15:45, F102

Nondipole time delay and double-slit interference in tunneling ionization — •Peilun He, Karen Hatsagortsyan, and Christoph Keitel — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany

The photon takes zeptoseconds time to travel through the bond length of a molecule, which results in the fringe shift of the photoelectron momentum distribution. We investigate the possibility of decoding this nondipole time delay signal in tunneling ionization. With the newly developed Coulomb-corrected nondipole molecular strong-field approximation [PRL 128, 183201 (2022)], we derive and analyze the photoelectron momentum distribution, the signature of nondipole effects, and the role of the degeneracy of the molecular orbitals. We show that the ejected electron momentum shifts and interference fringes efficiently imprint both the molecule structure and laser parameters. The corresponding nondipole time delay value significantly deviates from that in single-photon ionization. In particular, when the two-center interference in the molecule is destructive, the time delay is independent of the bond length. We also identify the double-slit interference in tunneling ionization of atoms with nonzero angular momentum via a nondipole momentum shift.