Multi-MeV electrons from above-threshold ionization of the neon K-shell
Abstract
We present measurements of integrated electron energies produced by above-threshold ionization (ATI) of neon in a laser field with intensity exceeding 1020 W/cm2. We observe electrons with energy exceeding 10 MeV ejected in the laser forward direction above a threshold intensity of 2 × 1020 W/cm2. We compare to ATI models using both tunneling (ADK-PPT) and barrier suppression ionization and observe the onset of ATI at a higher threshold intensity than predicted by these models.
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