The experimental determination of absorption coefficient of nitrogen plasma at 2820 A

Experiments for determining the absorption coefficient of nitrogen plasma at 2820°A at temperatures from 8000 to 12,000°K are described. It is assumed, by comparing experimental and analytic values, that a stable N$^{-}$ ion in the $^{3}$Р state may form in the nitrogen plasma. The probability of decay of N$^{-}$($^{3}$P) without absorption of a photon, in the radiation spectrum, of a nonthermal component, increases with rising temperature.