Accession Number : ADA551280


Title :   Kinetics of the Electric Discharge Pumped Oxygen-Iodine Laser


Descriptive Note : Doctoral thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT


Personal Author(s) : Lange, Matthew A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a551280.pdf


Report Date : Sep 2011


Pagination or Media Count : 178


Abstract : A systematic study of microwave discharges at 2.45 GHz has been performed through the pressure range of sustainable electric discharges in pure oxygen flows of 2 to 10 Torr. A corresponding study of 13.56 MHz has also been performed at pressures of 2, 4, and 7 Torr. Optical emissions from O2(a 1Δ), O2(b 1Σ), and O-atoms have been measured from the center of a μ-wave discharge. Discharge residence times from 0.1 to 5 ms have been reported. The O2(b 1Σ) emissions, with a spectral resolution of 0.01 nm, have been used to measure the temperature of the gas, which typically reaches a steady-state of 1,200 K. The interpretation of the measured O2(a 1Δ), yield, using a streamlined, nearly analytic model, cast new light on the kinetics within the electric discharge. The pseudo-first order quenching rate of O2(a 1Δ) ranges from 6,000 s-1 for μ-wave discharges to 600 s-1 for radio frequency (RF) discharges, independent of gas pressure and flow rate. The observations are consistent with a second order reaction channel that is dependent on both the electron and oxygen ground state concentrations. The role of vibrationally excited ground state oxygen is explored and provides a plausible destruction mechanism.


Descriptors :   *ELECTRIC DISCHARGES , *OPTICAL PROPERTIES , *OXYGEN IODINE LASERS , CONCENTRATION(CHEMISTRY) , CONSISTENCY , DESTRUCTION , ELECTRONS , EMISSION , GROUND STATE , KINETICS , MATHEMATICAL MODELS , MEASUREMENT , PUMPING , RADIOFREQUENCY , SPECTROSCOPY , STEADY STATE , TEMPERATURE


Subject Categories : Electricity and Magnetism
      Optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE