Anomalous collision-free multiple ionization of atoms with intense picosecond ultraviolet radiation

摘要: Collisionless multiphoton absorption, resulting in multiple atomic ionization and exhibiting anomalously strong coupling, has been studied the region spanning number $Z=2$ (He) to $Z=92$ (U). The highest ion state identified is ${\mathrm{U}}^{10+}$, corresponding absorption of 99 quanta (\ensuremath{\sim}633 eV). Models stepwise using standard theoretical techniques are incapable describing these results. A mode interaction involving radiative coupling a collective motion an shell proposed.