Higher order non-dipole effects in the angular distribution and spin polarization of photoelectrons from sodium 3s in the vicinity of the dipole Cooper minimum*

The impact of electric-dipole and electric-quadrupole interference terms (E1-E2) on the photoionization dynamics of Na 3s subshell, in the vicinity of dipole Cooper minimum, was analyzed in our recent work [1]. We have now extended this work by including second order non-dipole corrections to the dynamics. The calculations now include contributions from electric-quadrupole/electric-quadrupole (E2-E2) and electric-dipole/electric-octupole interference terms (E1-E3). The non-dipole parameters are derived from the general formulation of angular distribution of photoelectrons developed by Keh-Ning Huang [2, 3]. A combination of GRASP [4-5] and RATIP [6] packages are employed to obtain the required transition amplitudes. Furthermore, we explore the effect of higher order non-dipole interactions on the spin polarization of emitted photoelectron.

References

[1] Hosea, N. M., et.al., Atoms 2023, 11, 125.

[2] Huang, K. N., Physical Review A 1980, 22, 223.

[3] Huang, K. N., Physical Review A, 1982, 26, 3676.

[4] Parpia, F. A., et.al., Computer Physics Communications, 1996, 94, 249.

[5] Jönsson, P., et.al., Computer Physics Communications, 2013, 184, 2197.

[6] Fritzsche, S., Computer Physics Communications, 2012, 183, 525.