[en] Luminescence in BCl₃ is investigated. The results of measurements of gas temperature, BCl molecules concentration, and luminescence absolute intensity at boron trichloride presure of 40 mm pH and density of laser pulse energy from 1.7 up to 4.0 J/cm² are obtained. Nature of uninterrupted spectrum is considered. It is established that luminescence appearing in the BCl₃ under action of pulse CO₂-laser is caused by reaction of emitting recombination of BCl molecules with chlorine atoms. Rate constant of this reaction in the range of 2300-3100 K is determined