"back-ionization" . "Strong field approximation" . "ionisation" . "Atomic stabilization" . "ionizing radiation" . "photo-fragmentation" . "highly ionized" . "ionization" . . "ionize" . . "ionization threshold" . "bound-free absorption" . . "Ionization" . . . "Theory of nonsequential ionization" . "ionized" . "Ionization" . "electrically charged" . "un-ionized" . "turned" . "singly-ionized" . "ion pairs" . "ionised particles" . "charged" . "ionised state" . . "ionic" . "ionization technique" . "ionized gas" . "single-electron ionization" . "ionizes" . "neutral" . "pre-ionize" . . "interaction of charged particles with matter" . . "ionise" . "Ionisation" . . . . "ionizing" . "singly ionized" . "non-ionized" . . . "ionizable" . "direct ionization" . "ionised" . "ionization tunneling" . . "soft ionization" . "ion-pairs" .