Surprise in Highly Correlated Two-Electron System: Extended Secondary Plateau in X-ray High Harmonic Generation from Helium Due to Double Electron Recombination

1. Wang, S.
2. Yan, J.
3. de las Heras, A.
4. Song, S.
5. Prodanov, A.
6. Wu, Z.
7. Hernández-García, C.
8. Plaja, L.
9. Popmintchev, D.
10. Popmintchev, T.