Resonance absorption measurements of atom concentrations in reacting gas mixtures. IX. Measurements of O atoms in oxidation of H/sub 2/ and D/sub 2/

Book · Thu Jan 01 00:00:00 EST 1981

OSTI ID:5758588

Pamidimukkala, K M; Skinner, G B

Resonance absorption spectroscopy has been used to measure oxygen atom concentrations in shock heated H/sub 2/-O/sub 2/-Ar and D/sub 2/-O/sub 2/-Ar mixtures at 1000 to 2500/sup 0/K. From data on rich and stoichiometric mixtures we found (mole/sup -1/ cm/sup 3/ s/sup -1/ for reaction 3 and mole/sup -2/ cm/sup 6/ s/sup -1/ for reaction 5) H + O/sub 2/ ..-->.. OH + O; K/sub 3/ = 1.2E14 exp(-67.4kJ/RT); H + O/sub 2/ + Ar ..-->.. HO/sub 2/ + Ar; K/sub 5/ = 4.5E14 exp(4.2kJ/RT); D + O/sub 2/ ..-->.. OD + O; K/sub 3D/ = 5.8E13 exp(-62.8kJ/RT); D + O/sub 2/ + Ar ..-->.. DO/sub 2/ + Ar; K/sub 5D/ = 2.2E14 exp(4.2kJ/RT). The kinetic isotope effect for reaction 3 was 1.4 at 1500K, while that for reaction 5 was 2.0 in the 1000 to 1200K range. Data from very lean H/sub 2/-O/sub 2/-Ar and D/sub 2/-O/sub 2/-Ar mixtures are consistent with the rate coefficients (mole/sup -1/ cm/sup 3/ s/sup -1/). O + H/sub 2/ ..-->.. OH + H; k/sub 4/ = 4.2E14 exp(-57.5kJ/RT); O + D/sub 2/ ..-->.. OD + D; K/sub 4D/ = 1.9E14 exp(-59.6kJ/RT). The isotope effect for reaction 4 from the above equations is 2.6 at 1500K, compared to 1.7 from N/sub 2/O experiments.

• DOE Contract Number: AC02-76ER02944
• OSTI ID: 5758588
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
DEUTERIUM
CHEMICAL REACTION KINETICS
ISOTOPE EFFECTS
HYDROGEN
OXYGEN
ABSORPTION SPECTROSCOPY
RESONANCE ABSORPTION
TEMPERATURE DEPENDENCE
ABSORPTION
ELEMENTS
HYDROGEN ISOTOPES
ISOTOPES
KINETICS
LIGHT NUCLEI
NONMETALS
NUCLEI
ODD-ODD NUCLEI
REACTION KINETICS
SPECTROSCOPY
STABLE ISOTOPES
400202* - Isotope Effects
Isotope Exchange
& Isotope Separation