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We analytically compute, in the first Born approximation for symmetric andasymmetric coplanar geometries, the triple differential cross sections forelectron-impact ionization of hydrogen atom in the metastable 2S-state at bothlow and high energies. The process is investigated by using the relativisticDirac-formalism and it is also shown that the nonrelativistic limit isaccurately reproduced when using low incident kinetic energies. At highenergies, relativistic and spin effects significantly affect the tripledifferential cross sections. Our analytical approach which seems exact iscompared to some other results in the nonrelativistic regime for asymmetriccoplanar geometry. For this particular process and in the absence of anyexperimental data and theoretical models at high energies, we are not in aposition to validate our model. We hope that the present study will providesignificant contribution to future experiments.

Relativistic electron-impact ionization of hydrogen atom from its metastable 2S-state in the symmetric/asymmetric coplanar geometries