An algorithm and a computer program implementing it are presented for calculation of the rovibronic intensities for a triatomic molecule in a “double-Renner-degenerate” electronic state. The program has been applied to investigate, by theoretical simulation, the absorption spectrum of HO2 in the X̃A2 and ÃA2 electronic states. The spectrum simulations are based on potential energy functions, electric dipole moment functions, and electric dipole transition moment functions constructed from ab initio values calculated at the core-valence MR-SDCI+Q/[cc-pVQZ (H), aug-cc-pCVQZ (O)] level of theory.

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