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As part of the SILCC-ZOOM project we present our first sub-parsec resolutionradiation-hydrodynamic simulations of two molecular clouds self-consistentlyforming from a turbulent, multi-phase ISM. The clouds have similar initialmasses of few 10$^4$ M$_{\odot}$, escape velocities of ~5 km s$^{-1}$, and asimilar initial energy budget. We follow the formation of star clusters with asink based model and the impact of radiation from individual massive stars withthe tree-based radiation transfer module TreeRay. Photo-ionizing radiation iscoupled to a chemical network to follow gas heating, cooling and moleculeformation and dissociation. For the first 3 Myr of cloud evolution we find thatthe overall star formation effciency is considerably reduced by a factor of ~4to global cloud values of < 10 % as the mass accretion of sinks that hostmassive stars is terminated after <1 Myr. Despite the low effciency, starformation is triggered across the clouds. Therefore, a much larger region ofthe cloud is affected by radiation and the clouds begin to disperse. The timescale on which the clouds are dispersed sensitively depends on the cloudsubstructure and in particular on the amount of gas at high visual extinction.The damage of radiation done to the highly shielded cloud (MC1) is delayed. Wealso show that the radiation input can sustain the thermal and kinetic energyof the clouds at a constant level. Our results strongly support the importanceof ionizing radiation from massive stars for explaining the low observed starformation effciency of molecular clouds

SILCC-ZOOM: The early impact of ionizing radiation on forming molecular clouds