Amplification and gas-dynamic parameters of the active oxygen–iodine medium produced by an ejector nozzle unit

The gain, the temperature, and the absolute velocity of the supersonic active oxygen–iodine medium produced by an ejector nozzle unit were determined by the technique of high-resolution diode laser spectroscopy. The gain in the active medium is formed at less than 44 mm from the nozzle unit for an absolute flow velocity ν ≈ 600 m s^-1. Upon dilution of oxygen by primary nitrogen in the ratio of 1 : 6.9, the gain of the active medium amounts to 7 × 10^-3 cm^-1, the temperature of the active medium to 200 K, the absolute flow velocity to 580 m s^-1, and the pressure to 58 Torr. As the dilution is increased to 1 : 13.5, the gain reduces to 4.5 × 10^-3 cm^-1, the temperature lowers to 180 K, the velocity of the active medium increases to 615 m s^-1, and the pressure increases to 88 Torr. The increase in the initial content of water vapour in the oxygen flow results in an increase in the temperature and a decrease in the gain of the active medium.