DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click
HERE to register or log in.
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
Report Date:
2011-09-01
Pagination or Media Count:
178.0
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 O2a 1916, O2b 1931, and O-atoms have been measured from the center of a 956-wave discharge. Discharge residence times from 0.1 to 5 ms have been reported. The O2b 1931 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 O2a 1916, yield, using a streamlined, nearly analytic model, cast new light on the kinetics within the electric discharge. The pseudo-first order quenching rate of O2a 1916 ranges from 6,000 s-1 for 956-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.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE