Determination of the NO sub 3 + NO sub 2 yields NO + O sub 2 + NO sub 2 rate constant by infrared diode laser and fourier transform spectroscopy

Journal Article · Thu Jul 13 00:00:00 EDT 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100351a028· OSTI ID:6972024

Hjorth, J; Cappellani, F; Nielsen, C J; Restelli, G ^[1]

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1. Commission of the European Communities, Ispra (Italy)

The rate constant, k{sub 1}, at 296 K for the reaction NO{sub 3} + NO{sub 2} {yields} NO + NO{sub 2} + O{sub 2} has been determined relative to the rate constant, k{sub 2}, for the reaction NO{sub 3} + NO {yields} 2NO{sub 2} by direct measurement of (NO) and (NO{sub 2}) in a steady-state situation where the effect of the thermal decomposition of NO{sub 3} was negligible. NO{sub 3} was generated in the presence of a large excess of NO{sub 2}. The (NO{sub 2}) was determined by FTIR while the (NO) was measured with a tunable diode laser spectrometer operated in second-harmonic detection mode. From a series of 18 experiments performed at 50- and 15-Torr total pressures, the rate constant k{sub 1} was calculated at 296 K as k{sub 1} = ((1.5 {plus minus} 0.28) {times} 10{sup {minus}26})/k{sub 2} cm{sup 3} molecule{sup {minus}1} s{sup {minus}1}. Assuming the rate constant k{sub 2} = (3.0 {plus minus} 0.9) {times} 10{sup {minus}11} cm{sup 3} molecule{sup {minus}1} s{sup {minus}1}, a k{sub 1} value at 296 K equal to (5.1 {plus minus} 1.8) {times} 10{sup {minus}16} cm{sup 3} molecule{sup {minus}1} s{sup {minus}1} is calculated.

• OSTI ID: 6972024
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:14; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

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DATA ANALYSIS
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EXPERIMENTAL DATA
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