Stability of the Rydberg H3O Radical

p type function is added to hydrogen (αp = 0.990495).23 The diffuse Rydberg basis functions (αs = 0.08, 0.032; αp = 0.051, 0.02; αd = 0.345, 0.143)22 are further augmented on oxygen to describe the Rydberg states of H2O and H3O. The geometric parameters and the relative energies of H3O dissociating into (H2O + H) are listed in Table 1 together with the ionization and excitation energies of H2O and H3O. There are no previous experimental and theoretical results on H3O to compare with our results. Since the ground stat