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We present the first experimental observation of above-threshold ionization(ATI) electrons produced by ionization of the neon K-shell in a laser fieldwhere intensity exceeds 10$^{20}$ W/cm$^{2}$. An array of plastic scintillatingcalorimeter detectors was used to measure the high-energy electrons at fourangles in the laser forward direction. Coarse energy resolution was obtainedusing aluminum filters of several thicknesses to block lower-energy electrons.A threshold intensity around $2 \times 10^{20}$ W/cm$^{2}$ is observed forproduction of energetic ATI electrons in the laser forward direction, withmaximum electron energy exceeding 10 MeV. L-shell electrons with energies < 1.4MeV are scattered further forward along the laser direction than expected. Wepresent comparisons of the measured total electron energies to the predictionsof a Monte Carlo models employing the ADK-PPT ionization model and the Augstbarrier suppression ionization model.

Above-threshold ionization at laser intensity greater than $10^{20}$ W/cm$^{2}$