Characteristic X-ray production in the RCE process

Density matrix approach [V.V. Balashov, I.V. Bodrenko, Moscow State Univ. Bull. Phys. Astron. 1 (2001) 27] to describe characteristic X-ray production under resonant coherent excitation of channeled ions (the RCE process) is applied to the case of helium-like N5+ ions in gold crystal.