XUV ionization of the H2 molecule studied with attosecond angular streaking
Abstract
We study orientation and two-center interference effects in attosecond time-resolved photoionization of the H2 molecule. Time resolution of XUV ionization of H2 is gained through the phase retrieval capability of attosecond angular streaking demonstrated earlier by Kheifets et al [arXiv:2202.06147 (2022)]. Once applied to H2, this technique delivers an anisotropic phase and time delay which both depend sensitively on the molecular axis orientation. In addition, the photoelectron momentum distribution displays a very clear two-center interference pattern. When the interference formula due to Walter and Briggs [J. Phys. B 32 2487 (1999)] is applied, an effective photoelectron momentum appears to be greater than the asymptotic momentum at the detector. This effect is explained by a molecular potential well surrounding the photoemission center.
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