Multi-Sideband RABBITT in Ar: Experiment and Theory

The reconstruction of attosecond beating by interference of two-photon transitions (RABBITT) method is a widely employed technique to measure attosecond time delays in photo-ionization processes [1]. Recently, a three-sideband scheme was suggested [2] and analyzed in detail for atomic hydrogen [3].

Here we present our first experimental data using an Ar target, which is easier to handle experimentally but more challenging for theory, due to the multi-electron nature and the active 3p electron having a non-vanishing orbital angular momentum. Consequently, we used the multi-electron R-matrix with time dependence method (RMT) [4] to generate theoretical predictions that will be compared with experimental data.

[1] J. Dahlström et al., Chem. Phys. 414 (2013) 53.

[2] A. Harth et al., PRA 99 (2019) 023410.

[3] D. Bharti et al., PRA 103 (2021) 022834.

[4] A. C. Brown et al., Comput. Phys. Comm. (2019) 107062.