Abstract:
The analytical structure and absolute values of the generalized cross section of two-photon single ionization of the $K$ shell of a heavy neon-like ion of the iron atom (Fe$^{16+}$) have been theoretically predicted. A pronounced resonant pre-threshold structure of the generalized cross section and the effect of destructive quantum interference of the probability amplitudes of radiation transitions to virtual excited states of $p$-symmetry have been established. The presence of a valence $2p^6$ shell in the ion core causes the birth of an additional giant resonance of generalized cross-section as an effect of the “reverse” hard X-ray emission of the $K_\alpha$ type $1s^2(2s^2)2p^5+\hbar\omega\to 1s(2s^2)2p^6$. A scheme of the proposed experiment with linearly polarized X-ray photons is presented to verify the theoretical results obtained.
Keywords:two-photon single ionization, neon-like atomic ion, probability amplitude, generalized cross section.
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