SAMOP 2021 – scientific programme
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A: Fachverband Atomphysik
A 7: Attosecond physics
A 7.4: Poster
Tuesday, September 21, 2021, 16:30–18:30, P
Chiral imaging with twisted photoelectrons — Xavier Barcons1, Andrés Ordonez1, Maciej Lewenstein1, and •Andrew Maxwell1,2 — 1ICFO - Institut de Ciencies Fotoniques, Av. Carl Friedrich Gauss 3, 08860 Castelldefels (Barcelona), Spain — 2Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
The orbital angular momentum (OAM) of a free particle is a quantized observable leading to a rotating vortex wave. Twisted light and electrons have huge potential in imaging of matter in attosecond physics. Much attention has been devoted to the OAM of light fields, but in this work we will focus on the less-studied photoelectron OAM (PEOAM), exploring the great potential to image chiral matter.
In previous work, we developed an adapted version of the well-known strong-field approximation (SFA), to derive strong-field conservation laws for the OAM twisted electrons. This was exploited, in other work, to provide an alternative interpretation on existing experimental work of vortex interferences caused by strong field ionization.
Now we investigate the ability to probe chiral states with PEOAM. Exploiting a construction of chiral states from hydrogenic orbitals, allows an analytical and numerical demonstration of how chirality is encoded in the PEOAM. We will show, that asymmetries maybe observed in the OAM resolved photoelectron momentum distributions for strong-field ionization via a linearly polarized field. Thus, paving the way for a new kind of chiral specific imaging technique that, unlike photoelectron circular dichroism, may use linear fields.