Ro-vibrational transition energies and absorption intensities of the (1)A(1) states of H2O, He2O2+ and He2S2+

Variational ro-vibrational wave functions are calculated using an Eckart-Wa tson Hamiltonian, which has embedded an ab initio potential energy function . These wave functions, together with an ab initio dipole moment function, are employed to predict transition energies and absorption intensities. The radiative transition probability integrals are determined using a novel ad aptation of the Harris-Engerholm-Gwinn integration scheme. The method and s olution algorithm yields results in excellent agreement with previously det ermined experimental and theoretical electric dipole allowed transitions fo r the (1)A(1) ground state of H2O. The method has also been applied to the (1)A(1) states of the helide analogs of water, namely He2O2+ and He2S2+, in order to predict their ro vibrational transition energies and absorption i ntensities, thereby facilitating their possible interstellar detection.