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Thin films of boron carbide were formed by pulsed laser deposition at room temperature using a sintered B 4 C target. The nature of the particulates embedded in the films and the composition and bonding states of the films varied depending on the laser fluence. The formation of non-stoichiometric amorphous films appeared to be dominated by the arrival of energetic B and C atomic species with expansion velocities of 1-30 km/s and the stability of chemical bonds.