CaltechAUTHORS
Published October 29, 2010 | Version Supplemental Material
Journal Article Open

Rate of Gas Phase Association of Hydroxyl Radical and Nitrogen Dioxide

Creators

Abstract

The reaction of OH and NO_2 to form gaseous nitric acid (HONO_2) is among the most influential in atmospheric chemistry. Despite its importance, the rate coefficient remains poorly determined under tropospheric conditions because of difficulties in making laboratory rate measurements in air at 760 torr and uncertainties about a secondary channel producing peroxynitrous acid (HOONO). We combined two sensitive laser spectroscopy techniques to measure the overall rate of both channels and the partitioning between them at 25°C and 760 torr. The result is a significantly more precise value of the rate constant for the HONO_2 formation channel, 9.2 (±0.4) × 10^(−12) cm^3 molecule^(−1) s^(−1) (1 SD) at 760 torr of air, which lies toward the lower end of the previously established range. We demonstrate the impact of the revised value on photochemical model predictions of ozone concentrations in the Los Angeles airshed.

Additional Information

© 2010 American Association for the Advancement of Science. Received for publication 1 June 2010; accepted for publication 24 September 2010. This work was supported by National Aeronautics and Space Administration (NASA) grants NAG5-11657, NNG06GD88G, and NNX09AE21G; California Air Resources Board contracts 03-333 and 07-730; National Science Foundation grant CHE-0515627/0848242 (A.B.M.); a NASA Earth Systems Science Fellowship (A.K.M.); and a Department of Defense National Defense Science and Engineering Graduate Fellowship (M.K.S.). Research at JPL was supported by the NASA Upper Atmosphere Research and Tropospheric Chemistry Programs. This work was carried out in part at JPL, California Institute of Technology, under contract with NASA.

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Additional details

Identifiers

Eprint ID
20894
DOI
10.1126/science.1193030
Resolver ID
CaltechAUTHORS:20101118-114740373

Related works

Describes
10.1126/science.1193030 (DOI)

Funding

NASA
NAG5-11657
NASA
NNG06GD88G
NASA
NNX09AE21G
California Air Resources Board
03-333
California Air Resources Board
07-730
NSF
CHE-0515627
NASA Earth Systems Science Fellowship
National Defense Science and Engineering Graduate (NDSEG) Fellowship
NSF
CHE-0848242

Dates

Created
2010-11-19
Created from EPrint's datestamp field
Updated
2021-11-09
Created from EPrint's last_modified field