HCL chemical laser action has been obtained from chloro compounds when HI was used as the source of H atoms. Laser action was produced on several

, and 1-0 HCl transitions when initiated by transverse pulsed discharges in HI-He mixtures containing such chloro compounds as CCl
4, CHCl
3, and several Freons. Both HCl and HF lasing were observed when a Freon (C
2Cl
2F
4) containing F as well as Cl was used. The measured wavelengths for these HCl lasers correspond to excellent atmospheric windows for transmission of infrared radiation. No HCl lasing was obtained when HBr, H
2S, or H
2were substituted for HI.