Knowledge Bank

Collision induced dissociation reactions of $N2O-$ studied in beam experiments yields $DNO=0.43\pm 0.1eV$. From this result $DNN=5.13\pm 0.1eV$ and the adiabatic $EA=0.22\pm 0.1eV$. Ab initio MCSCF/CI calculations with a better than double zeta basis set yields a minimum in $Cs$ symmetry: $(RNNRNO-NNO)=(1-220$ \AA, 1.373 \AA, $132.7\circ )$. The vibrational frequencies are predicted to be $1030\pm 60,620\pm 30$, and $1720\pm 70cm-1$ . The computed dipole moment is $2.42\pm 0-1$ debye. The negative ion surface was related to that of the ground state neutral by representing each by an angle-dependent Morse $function.1$ All parameters were defined by the results of the present and previous $studies.2$ The angular dependence of each function was modified to be that of the anharmonic, ab initio, bending potential energy curve. This representation of the surfaces yields a threshold of $0.47\pm 0.1$ eV at $(RNN\ast ,RNO\ast ,\angle NNO\ast )=$(1.17 \AA, 1.28\ \AA, $153\circ )$ for the dissociative attachment process $N2O+e-=N2+0-$. The threshold for the reverse, associative detachment, process is $0.25\pm 0.1$ eV. A dynamic hindrance found for these processes will be discussed with the aid of a contour plot for the neutral surface superimposed on one for the negative surface.