NCl_3 as a source of NCl(a) for an NCl(a)-l laser

摘要

NCl_3 is a more stable source of NCl(a) than HN_3. The use of NCl_3 as a source of NCl(a~1Δ) for use in an iodine transfer laser has been modeled. The model suggests that gain can be obtained on the spin orbit transition of the iodine atom at 1.315蘭 in a purely chemical system. New quenching rates of NCl(a) by H_2 and HCl show these species are not a serious problem in scaling the NCl_3 system to high energy densities. The measurements of NCl(a) in our flow tube system are obscured at early times by Cl_2(B-X) radiation from the Cl atom induced decomposition of NCl_3. We have measured the contribution of this emission and find that the profile more closely matches the profile predicted by the kinetics code. We have measured the yield of Cl atoms produced by a microwave discharge of 5% Cl_2 in He and find a dissociation fraction of about 25% in agreement with previous studies by Manke and Setser. The yield was measured by titrating the Cl atoms with HI and observing the HCl(v=1) radiation. In studies of the production of NCl_3, we have found that the yield of NCl_3 is independent of the gas side mass transfer conditions. Our current reactor produces an NCl_3 yield of about 20% relative to Cl_2. Since the production of higher flows of NCl_3 is important for a laser experiment, we present some ideas for scaling NCl_3 to higher flow rates. The use of NCl_3 as a source of NCl(a~1Δ) for use in an iodine transfer laser has been modeled. The model suggests that gain can be obtained on the spin orbit transition of the iodine atom at 1.315μm in a purely chemical system. The experimental data obtained to this point supports the model predictions.