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arXiv · 2004.01814

Angle-resolved non-resonant two-photon single ionization of argon using 9.3 eV photons produced via high harmonic generation

Kirk A. Larsen·Daniel S. Slaughter·Thorsten Weber
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Abstract

We present an experimental study on the photoionization dynamics of non-resonant one-color two-photon single valence ionization of neutral argon atoms. Using 9.3 eV photons produced via high harmonic generation and a 3-D momentum imaging spectrometer, we detect the photoelectrons and ions produced from non-resonant two-photon ionization in coincidence. Photoionization from the $3p$ orbital produces a photoelectron scattering wave function with $p$ and $f$ partial wave components, which interfere and result in a photoelectron angular distribution with peak amplitude perpendicular to the VUV polarization. The comparison between the present results and two previous sets of theoretical calculations [Pan, C. & Starace, A. F. (1991). $\textit{Physical Review A}$, 44(1), 324., and Moccia, R., Rahman, N. K., & Rizzo, A. (1983). $\textit{Journal of Physics B: Atomic and Molecular Physics}$, 16(15), 2737.] indicates that electron-electron correlation contributes appreciably to the two-photon ionization dynamics.

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Kirk A. Larsen, Daniel S. Slaughter, Thorsten Weber. 2020-04-03. Angle-resolved non-resonant two-photon single ionization of argon using 9.3 eV photons produced via high harmonic generation. https://doi.org/10.1103/physreva.101.061402

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