Franck—Condon Factors for the Ionization of CO, NO, and O2

Calculated values of the vibrational overlap integrals for the following transitions are given: $$(\mathrm{a}\mathrm{)\hspace{0.17em}}\mathrm{CO}{\mathrm{(X\hspace{0.17em}}}^1{\Sigma }^{+}{\mathrm{,\hspace{0.17em}v}}^{\mathrm{\prime \prime }}\text{=0)→}{\mathrm{CO}}^{+}{\mathrm{(X\hspace{0.17em}}}^2{\Sigma }^{+}{\mathrm{,\hspace{0.17em}v}}^{\prime }{\text{=0→10);\hspace{0.17em}(A\hspace{0.17em}}}^2{\Pi }_i{\mathrm{,\hspace{0.17em}v}}^{\prime }{\text{=0→10);\hspace{0.17em}(B\hspace{0.17em}}}^2{\Sigma }^{+}{\mathrm{,\hspace{0.17em}v}}^{\prime }\text{=0→10).}$$ $$(\mathrm{b}\mathrm{)\hspace{0.17em}}\mathrm{NO}{\mathrm{(X\hspace{0.17em}}}^2{\mathrm{\Pi ,\hspace{0.17em}v}}^{\mathrm{\prime \prime }}\text{=0)→}{\mathrm{NO}}^{+}{\mathrm{(X\hspace{0.17em}}}^1{\Sigma }^{+}{\mathrm{,\hspace{0.17em}v}}^{\prime }{\text{=0→10);\hspace{0.17em}(A\hspace{0.17em}}}^1{\mathrm{\Pi ,\hspace{0.17em}v}}^{\prime }\text{=0→10).}$$ $$(\mathrm{c}\mathrm{)\hspace{0.17em}}{\mathrm{O}}_2{\mathrm{(X\hspace{0.17em}}}^3{\Sigma }_g^{-}{\mathrm{,\hspace{0.17em}v}}^{\mathrm{\prime \prime }}\text{=0,\hspace{0.17em}1)→}{\mathrm{O}}_2^{+}{\mathrm{(X\hspace{0.17em}}}^2{\Pi }_g{\mathrm{,\hspace{0.17em}v}}^{\prime }{\text{=0→10);\hspace{0.17em}(a\hspace{0.17em}}}^4{\Pi }_u{\mathrm{,\hspace{0.17em}v}}^{\prime }{\text{=0→15);\hspace{0.17em}(A\hspace{0.17em}}}^2{\Pi }_u{\mathrm{,\hspace{0.17em}v}}^{\prime }{\text{=0→20);\hspace{0.17em}(b\hspace{0.17em}}}^4{\Sigma }_g^{-}{\mathrm{,\hspace{0.17em}v}}^{\prime }\text{=0→10).}$$ These probabilities are used to construct theoretical ionization‐efficiency curves assuming an energy dependence for the electronic transition integral for both photoionization and ionization by electron impact. Previously published experimental data are discussed in terms of the theoretically calculated Franck—Condon probabilities.