Equilibrium geometries of the ground states of hydrogen peroxide (H(2)O(2)) and methyl hydroperoxide (CH(3)OOH) have been obtained using quadratic configuration interaction methods with correlation-consistent basis sets. These results are compared with experiments and prior calculations. The dipole moments of the ground states of these two molecules have been calculated. The results illustrate the sensitivity of this quantity to molecular geometry. Several excited states of H(2)O(2) and CH(3)OOH were calculated using the equation-of-motion coupled-cluster singles-and-doubles method. Aside from vertical excitation energies, excited state energies along the O-O, O-H, and C-O dissociation pathways were calculated. The results are expected to be of assistance in resolving discrepancies in the experimental interpretation of the UV absorption spectrum and photodissociation of CH(3)OOH.
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