We have studied core-valence double photoionization (DPI) of Ne leading to the $1s^{-1}2s^{-1}{}^{1,3}S$ and $1s^{-1}2p^{-1}{}^{1,3}P$ states of ${\mathrm{Ne}}^{2+}$ over a range of photon energy extending up to approximately 200 eV above the thresholds using a multielectron coincidence technique. Each DPI process is distinctly identified in the energy correlation between two photoelectrons. The ratios of singlet-to-triplet cross sections exhibit variation with photon energy, indicating a spin dependence in the DPI dynamics. The state-resolved DPI probabilities have been investigated by an incoherent sum of the knock-out (KO) and shake-off (SO) contributions, revealing a significant disparity in the dynamics of the KO mechanism between the DPI into the ${}^{1}P$ and ${}^{3}P$ states.

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• Atomic spectra
• Autoionization & Auger processes
• Electronic excitation & ionization
• Electronic transitions
• Single- and few-photon ionization & excitation