Experiments have been carried out to investigate a new method for generating O2(1&Dgr;) with long‐time operation of an efficient chemical oxygen‐iodine laser system in mind. An impinging‐jet nozzle was utilized to atomize a H2O2‐KOH solution so that the alkaline H2O2/Cl2reaction might occur in droplet‐gas phase with high excitation efficiency. Experimental results indicate that the present generator can yield as high as 80% of O2(1&Dgr;) with reasonable O2flow rate.