Direct determination of atom and radical concentrations in thermal reactions of hydrocarbons and other gases

Technical Report · Thu Jan 01 04:00:00 EST 1981

DOI:https://doi.org/10.2172/6875845· OSTI ID:6875845

Skinner, G. B.; Pamidimukkala, K. M.; Wood, D. R.

This is the fifth annual progress report on this project. During the period covered by the first four reports (June 1976 through December 1979) a shock tube and an optical system to measure H and D atom concentrations were built and fully characterized. The performance of our microwave discharge lamps was defined by numerous high-resolution spectroscopic profiles, while empirical calibrations were made using mixtures of D/sub 2/-N/sub 2/O-Ar and hexamethylethane-Ar. H and D atom concentrations were measured in gas mixtures containing H/sub 2/, D/sub 2/, O/sub 2/, CD/sub 4/, C/sub 2/H/sub 6/, C/sub 2/D/sub 6/, C/sub 3/H/sub 8/ and C/sub 3/D/sub 8/ in various proportions, and rate constants of several elementary reactions were deduced from the data. During 1979 the apparatus was modified by addition of an ultraviolet monochromator so that measurements of O, OH and other species besides H and D may be measured. During the past year empirical calibrations for O atom concentrations were made, and correlated with O-atom line shapes measured earlier. Measurements of O-atom concentrations were made in several H/sub 2/-O/sub 2/-Ar and D/sub 2/-O/sub 2/-Ar mixtures, and rate constants of elementary reactions deduced from these measurements. A series of calculations of thermodynamic properties of CH/sub 3/, CD/sub 3/, C/sub 2/D/sub 2/, C/sub 2/D/sub 4/, C/sub 2/H/sub 6/ and C/sub 2/D/sub 6/, which were either unavailable or outdated, was made for use in our work. A microcomputer system was installed to speed data acquisition and processing.

• Research Organization: Wright State Univ., Dayton, OH (USA)
• Sponsoring Organization: USDOE
• DOE Contract Number: AS02-76ER02944
• OSTI ID: 6875845
• Report Number(s): COO--2944-5
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKANES
ALKYL RADICALS
ARGON
ATOMS
CHEMICAL REACTION KINETICS
DEUTERIUM
DEUTERIUM COMPOUNDS
ELEMENTS
ETHANE
FLUIDS
GASES
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
ISOTOPES
KINETICS
LIGHT NUCLEI
METHYL RADICALS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXYGEN
PHYSICAL PROPERTIES
RADICALS
RARE GASES
REACTION KINETICS
RESEARCH PROGRAMS
SHOCK TUBES
STABLE ISOTOPES
THERMODYNAMIC PROPERTIES