Dissociation of water solution of (5-nitrotetrazolato-N²)pentaaminecobalt(III) perchlorate (NCP) under laser irradiation with 355 nm wavelength was investigated by IR and Raman spectroscopy and energy-dispersive spectroscopy analysis. This light energy is in resonance with d-d transitions (¹A_1g → ¹T_2g) of Co³⁺ cations. Condensed products of such dissociation mainly consist of Co₃O₄, CoOOH, perchlorate anions, and possibly nitrotetrazolate anions, which differ from the products at conventional thermal decomposition.