Emission Cross Sections of CO2 by Electron Impact in the Interval 1260–4500 Å. II

A survey of the most prominent emission features produced by electron impact excitation of CO₂ over the wavelength range of 1260–4500 Å has been completed. Emission cross sections were measured from threshold to 300 eV for the ${Ã}^2{\mathrm{H}}_u{\mathrm{\to X̃}}^2{\Pi }_g$ and ${\mathrm{B̃}}^2{\Sigma }_u^{+}{\mathrm{\to \; X̃}}^2{\Pi }_g$ electronic transitions of ${\mathrm{CO}}_2^{+}$ produced by ionization excitation of CO₂. Emission cross sections were also measured for the $A^1{\mathrm{\Pi \to X}}^1{\Sigma }^{+}$ electronic transition of CO and the $B^2{\Sigma }^{+}{\mathrm{\to \; X}}^2{\Sigma }^{+}$ electronic transition of CO⁺ produced by dissociative excitation of CO₂. The vibronic intensities differed from those for electron excitation of CO. In addition, emission cross sections are presented for the ${}^3{S}^0{\to }^{3}P$ , 1304‐Å multiplet of OI, the ${}^2{\mathrm{D\; \to }}^2{P}^0$ , 1335‐Å multiplet of CII, and several atomic multiplets of CI produced by dissociative excitation of CO₂. The relative energy variation of the emission cross section of the $a^3{\mathrm{\Pi \to X}}^1{\Sigma }^{+}$ electronic transition of CO and of the ${}^5{S}^0{\to }^{3}P$ , 1356‐Å multiplet of OI were also measured. The processes leading to these emissions are discussed.