Two-photon knocking-out of two electrons of the 1s2-shell of the neon atom

The absolute values and shape of the cross section for the process of two electron excitation/ionization of the 1s(2) shell of the Ne-10 atom by two linearly polarized photons are calculated using second order quantum mechanical perturbation theory. The many particle effects of relaxation of the atomic residue in the field of creating virtual vacancies and the decay of vacancies via Auger and/or radiative channels are taken into account. It is shown that the probability of the process of two photon absorption by the deep 1s(2) shell accompanied by the creation of double Is vacancies essentially predominates over the probability of the process of two photon one electron excitation/ionization of the 1s(2) shell in the range of x ray photon energies homega greater than or equal to 930 eV.