Pressure and temperature dependences of the reaction of OH with nitric acid

Journal Article · Thu Jun 05 00:00:00 EDT 1986 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100403a044· OSTI ID:5697755

Stachnik, R A; Molina, L T; Molina, M J

Rate constants for the reaction of OH with HNO/sub 3/ have been measured by using a laser flash photolysis resonance absorption technique at 298 and 248 K in the presence of 10-730 Torr of He, N/sub 2/, and SF/sub 6/. A dependence on total pressure was observed with rate constant values increasing at 298 K from 1.11 x 10/sup -13/ cm/sup 3/ molecule/sup -1/ s/sup -1/ at 10 Torr to 1.45 x 10/sup -13/ cm/sup 3/ molecule/sup -1/ s/sup -1/ at 730 Torr, and at 248 K from 1.87 x 10/sup -13/ cm/sup 3/ molecule/sup -1/ s/sup -1/ at 10 Torr to 3.07 x 10/sup -13/ cm/sup 3/ molecule/sup -1/ s/sup -1/ at 730 Torr with helium as the diluent gas. Falloff behavior occurred at lower pressures with SF/sub 6/ or N/sub 2/ as the diluent gas. Extrapolated zero pressure rate constants were determined and correspond to an Arrhenius activation energy of E/R = -710 K.

• Research Organization: California Institute of Technology, Pasadena
• OSTI ID: 5697755
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:12; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSORPTION SPECTRA
ARRHENIUS EQUATION
CHEMICAL REACTION KINETICS
DATA
ELEMENTS
EQUATIONS
EXPERIMENTAL DATA
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
GASES
HALIDES
HALOGEN COMPOUNDS
HELIUM
HYDROGEN COMPOUNDS
HYDROXYL RADICALS
INFORMATION
INORGANIC ACIDS
KINETICS
MEDIUM TEMPERATURE
NITRIC ACID
NITROGEN
NONMETALS
NUMERICAL DATA
PRESSURE DEPENDENCE
RADICALS
RARE GASES
REACTION KINETICS
SPECTRA
SULFUR COMPOUNDS
SULFUR FLUORIDES