Determining the feasibility of performing circularly-polarized RABBITT calculations using the R-Matrix with Time-dependence method

The Reconstruction of Attosecond Beating by Interference of Two-photon Transitions (RABBITT) technique has seen much success in determining attosecond photoemission delays in atoms and molecules [1,2]. Many variants of the technique have also been developed, including Under-threshold RABBITT [3], Multi-sideband RABBITT [4], and other schemes involving cross-polarized pulses [5]. The most recent advancement of the technique is the utilization of circularly-polarized XUV and IR pulses in the RABBITT laser-pulse scheme, which offers the benefit of separating the single-photon ionization delay from the continuum-continuum (CC) delay [6]. In this work we seek to determine the feasibility of performing R-Matrix with Time-dependence [7] calculations for a RABBITT scheme using circularly polarized light incident on an argon target. This multielectron target, in combination with using circularly polarized light, drastically increases the computational burden of these calculations.





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[6] M. Han, J.-B. Ji, C. S., K. Ueda, and H. J. Wörner, Sci. Adv. 10 (2024) eadj2629

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