화학공학소재연구정보센터
Journal of Physical Chemistry A, Vol.111, No.29, 6713-6721, 2007
Oxygen discharge and post-discharge kinetics experiments and modeling for the electric oxygen-iodine laser system
Laser oscillation at 1315 nm on the I(P-2(1/2)) -> I(P-2(3/2)) transition of atomic iodine has been obtained by a near resonant energy transfer from O-2(a(1)Delta) produced using a low-pressure oxygen/helium/nitric oxide discharge. In the electric discharge oxygen-iodine laser (ElectricOIL) the discharge production of atomic oxygen, ozone, and other excited species adds levels of complexity to the singlet oxygen generator (SOG) kinetics which are not encountered in a classic purely chemical O-2(a(1)Delta) generation system. The advanced model BLAZE-IV has been introduced to study the energy-transfer laser system dynamics and kinetics. Levels of singlet oxygen, oxygen atoms, and ozone are measured experimentally and compared with calculations. The new BLAZE-IV model is in reasonable agreement with O-3, O atom, and gas temperature measurements but is under-predicting the increase in O-2(a(1)Delta) concentration resulting from the presence of NO in the discharge and under-predicting the O-2(b(1)Sigma) concentrations. A key conclusion is that the removal of oxygen atoms by NOX species leads to a significant increase in O-2(a(1)Delta) concentrations downstream of the discharge in part via a recycling process; however, there are still some important processes related to the NOX discharge kinetics that are missing from the present modeling. Further, the removal of oxygen atoms dramatically inhibits the production of ozone in the downstream kinetics.