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50, 2176 (1969), the dissociative attachment of electron to NO2 occurs only when the electron energy is above 1.35 eV. If this is the case, the O observed in our system may have been produced by collisions between NO2 and electrons emitted in the three‐photon ionization of Cs atoms, whose energy is greater than 1.92 eV for the ionization via an electron state higher than 23d.
9 9Novick, S.E., Engelking, P.C., Jones, P.L., Futrell, J.H., and Lineberger, W.C., J. Phys. Chem., 70, 2652 (1979).