Key points are not available for this paper at this time.
The level populations, b nl of hydrogen and singly ionized helium are calculated making full allowance for collisional redistribution of angular momentum and energy. In many cases the l -states are not populated statistically. Intensities of the most important line series are presented for n\, \, 40 and for a wide range of electron temperatures and electron densities. Calculated relative intensities in the spectra of H I are compared with observed intensities in the planetary nebula NGC 7662. The agreement with the photoelectric observations is good, but there is poor agreement with the photographic observations.
M. Brocklehurst (Wed,) studied this question.