Above-threshold ionization

Abstract Above-Threshold Ionization (ATI) is the name given to the absorption by an atomic electron of more photons than are required for ionization. ATI was discovered in 1979 and is now expected to be a universal phenomenon observable in all atomic species. The effect occurs readily in light pulses short enough to eliminate the influence of collisions, at intensities above 1 TW/cm 2 .

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