Pulsed electron-beam-sustained discharge in oxygen-containing gas mixtures: electrical characteristics, spectroscopy,and singlet oxygen yield
- P.N. Lebedev Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)
- State Research Center of Russian Federation 'Troitsk Institute for Innovation and Fusion Research', Troitsk, Moscow Region (Russian Federation)
- Air Force Research Laboratory, Albuquerque, NM (United States)
The electrical and spectroscopic characteristics of electron-beam-sustained discharge (EBSD) in oxygen and oxygen-containing gas mixtures are studied experimentally under gas pressures up to 100 Torr in a large excitation volume ({approx}18 L). It is shown that the EBSD in pure oxygen and its mixtures with inert gases is unstable and is characterised by a small specific energy contribution. The addition of small amounts ({approx}1%-10%) of carbon monoxide or hydrogen to oxygen or its mixtures with inert gases considerably improves the stability of the discharge, while the specific energy contribution W increases by more then an order of magnitude, achieving {approx}6.5 kJ L{sup -1} atm{sup -1} per molecular component of the gas mixture. A part of the energy supplied to the EBSD is spent to excite vibrational levels of molecular additives. This was demonstrated experimentally by the initiation of a CO laser based on the O{sub 2} : Ar : CO = 1 : 1 : 0.1 mixture. Experimental results on spectroscopy of the excited electronic states O{sub 2}(a{sup 1{Delta}}{sub g}) and O{sub 2}(b{sup 1{Sigma}}{sub g}{sup +}), of oxygen formed in the EBSD are presented. A technique was worked out for measuring the concentration of singlet oxygen in the O{sub 2}(a{sup 1{Delta}}{sub g}) state in the afterglow of the pulsed EBSD by comparing with the radiation intensity of singlet oxygen of a given concentration produced in a chemical generator. Preliminary measurements of the singlet-oxygen yield in the EBSD show that its value {approx}3% for W {approx} 1.0 kJ L{sup -1} atm{sup -1} is in agreement with the theoretical estimate. Theoretical calculations performed for W {approx} 6.5 kJ L{sup -1} atm{sup -1} at a fixed temperature show that the singlet-oxygen yield may be {approx}20%, which is higher than the value required to achieve the lasing threshold in an oxygen-iodine laser at room temperature. (laser applications and other topics in quantum electronics)
- OSTI ID:
- 21470598
- Journal Information:
- Quantum Electronics (Woodbury, N.Y.), Vol. 34, Issue 9; Other Information: DOI: 10.1070/QE2004v034n09ABEH002883; ISSN 1063-7818
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AFTERGLOW
BACKSCATTERING
CARBON MONOXIDE
ELECTRON BEAMS
EXCITATION
GAS LASERS
GLOW DISCHARGES
HYDROGEN
IODINE
MIXTURES
OXYGEN
RARE GASES
SPECTROSCOPY
STABILITY
TEMPERATURE RANGE 0273-0400 K
BEAMS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
DISPERSIONS
ELECTRIC DISCHARGES
ELEMENTS
ENERGY-LEVEL TRANSITIONS
FLUIDS
GASES
HALOGENS
LASERS
LEPTON BEAMS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PARTICLE BEAMS
SCATTERING
TEMPERATURE RANGE