Rovibrational energy levels for the electronic ground state of AlOH

The vibrational–rotational energy levels of aluminum monohydroxide in its electronic ground state, X ∼ 1 A ′ AlOH, have been predicted using the variational method. The potential energy surface of the X ∼ 1 A ′ ground state of AlOH was determined employing the ab initio coupled cluster method with single, double, and perturbative triple excitations [CCSD(T)] and the correlation-consistent polarized valence quadruple zeta (cc-pVQZ) basis set. Low-lying J = 0 and J = 1 vibrational levels are reported. These are analyzed in terms of the quasilinearity of the molecule. Coriolis effects are shown to be significant. We hope that our predictions will be of value in the future when assigning rovibrational transitions in spectroscopic studies.