First Demonstration of Ionization of Kr and Xe Atoms by Intense Nanosecond CO2 Laser Pulses
Many theories have been proposed addressing the fundamental question of optical field effect (optical tunnelling) during multiphoton ionization of atoms by very intense laser radiation [1, 2]. Often used as an indicator is the Keldish parameter γ [l], which varies from much larger than unity to much smaller, as one goes from pure multiphoton ionization to tunnelling effect.
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