  The cross sections of ultra-soft x-ray bremsstrahlung in at electron
scattering by Ar, Kr and Xe are theoretically calculated. The results are
consistent with the absolute values of the differential cross sections measured
by Gnatchenko et al [Phys. Rev. A 80, 022707 (2009)] for scattering electrons
with an energy of 600 eV on these atoms.

Atomic Physics