A possible contribution of negative atomic ions to the continuum radiation in nitrogen plasma is discussed. It is shown that both unstable ${\mathrm{N}}^{\mathrm{-}}$${(}^3$P) and metastable ${\mathrm{N}}^{\mathrm{-}}$${(}^1$D) ions may have a significant effect on the total production of the continuum radiation at electron temperatures below 12000 K. It is also suggested that the theoretical cross sections for the radiative attachments involving the negative ions are more reliable than the available experimental cross sections.

• Received 26 October 1989

DOI:https://doi.org/10.1103/PhysRevA.41.4531