Kinetics and mechanism of the OH + HO sub 2 reaction

Journal Article · Thu Feb 09 04:00:00 EST 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100340a005· OSTI ID:5062543

Schwab, J J; Brune, W H; Anderson, J G ^[1]

---

1. Harvard Univ., Cambridge, MA (USA)

A discharge flow reactor with laser magnetic resonance and resonance fluorescence detection axes is used to measure the rate constant for the reaction of OH and HO{sub 2} radicals by measuring the decay of OH in excess HO{sub 2} under pseudo-first-order conditions. Particular care is taken to reduce impurity O and H atoms to low levels since their presence leads to an underestimate of the rate constant. The rate constant is measured to be (8.0{sup +3.0}{sub {minus}2.0}) {times} 10{sup {minus}11} cm{sup 3} molecule{sup {minus}1} s{sup {minus}1} at 298 K and 2 Torr after a small (3%) correction is made for the impurity atoms. It is argued that recent experimental and theoretical results indicate that the reaction mechanism is likely dominated by attack at the hydrogen end of HO{sub 2} and that the reaction is unusually fast due a long-range attractive interaction.

• OSTI ID: 5062543
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:3; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
54 ENVIRONMENTAL SCIENCES
540110
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMICAL REACTORS
DATA
EXPERIMENTAL DATA
FLOW RATE
FLUID FLOW
FLUORESCENCE
HYDROPEROXY RADICALS
HYDROXYL RADICALS
INFORMATION
KINETICS
LASERS
LUMINESCENCE
NUMERICAL DATA
RADICALS
REACTION KINETICS