High level ab initio molecular orbital theory study of the structure,vibrational spectrum, stability, and low-lying excited states of HOONO

摘要

Ab initio molecular orbital methods have been employed to determine the molecular structure,vibrational frequencies,and stability of HOONO. These parameters were determined using quadratic configuration interactionmethods with Dunning's correlation consistent basis sets. Low-lying excited states for HOONO have been determined using complete active space self-consistent field (CASSCF) and multireference internally contracted configuration interaction (MRCI) methods. The first excited state (1~1A'')is calculated to be 4.19eV above the ground state f HOONO. Potential energy curves for the ground and excited states are presented.