The calculation of photoionization cross-section of negative hydrogen ions in the Born approximation
It is shown that the two-electron wave function of the system "hydrogen atom + photoelectron" in the Born approximation provides high accuracy of the photoionization process cross-section calculation of negative hydrogen ion. The partial cross-sections, which correspond to different ``reaction ns-channels'' in the scale of photoelectron energy and the scale of wavelengths are calculated. The comparisons with the results of other authors which obtained by other methods are performed.