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We propose a novel scheme for resolving the contribution of inner- andouter-valence electrons in XUV-initiated high-harmonic generation in neon. Byprobing the atom with a low energy (below the 2s ionisation threshold)ultrashort XUV pulse, the 2p electron is steered away from the core, while the2s electron is enabled to describe recollision trajectories. By selectivelysuppressing the 2p recollision trajectories we can resolve the contribution ofthe 2s electron to the high-harmonic spectrum. We apply the classicaltrajectory model to account for the contribution of the 2s electron, whichallows for an intuitive understanding of the process.

XUV-initiated high harmonic generation: driving inner valence electrons using below-threshold-energy XUV light