Articles you may be interested inConservation of the Kr+(2 P 1/2) state in the reactive quenching of Kr(5s′[1/2]0) atoms by halogencontaining molecules
A new Chemical Oxygen-Iodine Laser (COIL) has been developed and demonstrated at chlorine flow rates up to 1 gmol/s. The laser employs a cross flow jet oxygen generator operating with no diluent. The generator product flow enters the laser cavity at Mach 1 and is accelerated by mixing with 5 gmol/s, Mach 5 nitrogen diluent in an ejector nozzle array. The nitrogen also serves as the carrier for iodine. Vortex mixing is achieved through the use of mixing tabs at the nitrogen nozzle exit. Mixing approach design and analysis, including CFD analysis, led to the preferred nozzle configuration. The selected mixing enhancement design was tested in cold flow and the results are in good agreement with the CFD predictions. Good mixing was achieved within the desired cavity flow length of 20 cm and pressure recovery above 90 Torr was measured at the cavity exit. Finally, the design was incorporated into the laser and power extraction as high as 20 kw was measured at the best operating condition of 0.9 gmol/s. Stable resonator mode footprints showed desirable intensity profiles, with none of the sugar scoop profiles characteristic of the conventional COIL designs.
The production of electronically excited iodine atoms is observed by time-resolved atomic absorption spectroscopy following the dissociation of molecular iodine excited by a tunable dye laser to the 3 B Ilo+ state above and below the thermochemical dissociation limit. The quantum eAiciency is independent of excitation wavelength above the dissociation limit. Substantial yields of I(5'P ", ) are found for excitation as much as 4.5kT below the dissociation limit.
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