807306-99-6Relevant academic research and scientific papers
The reaction of NO3 with atomic oxygen
Canosa-Mas, Carlos E.,Carpenter, Peter J.,Wayne, Richard P.
, p. 697 - 708 (1989)
This paper describes the identification of a reaction between atomic oxygen, O(3P), and the nitrate radical, NO3, and the measurement of the kinetics of the process at room temperature. A discharge-flow technique was used, and atmic oxygen concentrations were determined by resonance fluorescence. The rate coefficient obtained was (1.7 ± 0.6) x 10-11 cm3 molecules-1 s-1. This value is compared with recently measured rate constants for the reactions of other atoms and radicals with NO3. The possibility is discussed of the reaction between O and NO3 occurring in the stratosphere.
Methods for preparing standard nitrate radical (NO3) gas to calibrate the LIF-based instrument for measurements in the atmosphere
Matsumoto, Jun,Imai, Hidekazu,Kosugi, Naohiro,Kajii, Yoshizumi
, p. 1214 - 1215 (2007/10/03)
Preparation of standard NO3 gas is explored at the level of ppbv for atmospheric measurements utilizing an LIF instrument. The sequence of thermal decomposition of N2O5 and gas phase titration of NO3 by adding NO is useful. To reduce NO2 contamination in N2O5, N2O5 trapping after mixing NOx and O3 was adopted. As a convenient method in the field studies, dynamic mixing of NOx and O3 was explored. Copyright
Reaction of OH with HO2NO2 (Peroxynitric Acid): Rate Coefficients between 218 and 335 K and Product Yields at 298 K
Jimenez, Elena,Gierczak, Tomasz,Stark, Harald,Burkholder, James B.,Ravishankara
, p. 1139 - 1149 (2007/10/03)
HO2NO2 (peroxynitric acid, PNA) has an important role in determining the ozone abundance and its changes over time in the lower stratosphere. Rate coefficients (k3(T)) for the reaction of OH with PNA in the gas phase were
Reaction of hydroxyl radical with nitric acid: Insights into its mechanism
Brown, Steven S.,Burkholder, James B.,Talukdar, Ranajit K.,Ravishankara
, p. 1605 - 1614 (2007/10/03)
The rate constant for the reaction of hydroxyl radicals with nitric acid has an unusual pressure and temperature dependence. To explore the mechanism for this reaction, we have measured rate constants for reactions of isotopically substituted species OD+DNO3, OH+DNO3, OD+HNO3, and 18OH+HNO3 and the yield of NO3 product. Deuterium substitution on nitric acid results in more than a 10-fold reduction in the rate constant, removes the pressure dependence (over the observed range of 20-200 Torr in He and SF6), and leads to a strongly curved Arrhenius temperature dependence. Deuterium substitution on hydroxyl increases the rate constant slightly but does not change the pressure dependence. There is no evidence for exchange reactions in the isotopically mixed reactions. Absorption measurements of the NO3 product yield show that the title reaction produces nitrate radical with unit efficiency over all temperatures and pressures studied. We discuss the implications of the measured rate constants, product yields, and lack of isotopic exchange in terms of a mechanism that involves formation of a hydroxyl radical-nitric acid complex and its subsequent reaction to give NO3 and H2O.
Temperature-dependent rate coefficients for the reactions of Br(2P3/2), Cl(2P3/2), and O(3PJ) with BrONO2
Soller,Nicovich,Wine
, p. 1416 - 1422 (2007/10/03)
A laser flash photolysis-resonance fluorescence technique has been employed to investigate the kinetics of reactions of the important stratospheric species bromine nitrate (BrONO2) with ground-state atomic bromine (k1), chlorine (k2), and oxygen (k3) as a function of temperature (224-352 K) and pressure (16-250 Torr of N2). The rate coefficients for all three reactions are found to be independent of pressure and to increase with decreasing temperature. The following Arrhenius expressions adequately describe the observed temperature dependencies (units are 10-11 cm3molecule-1s-1): k1 = 1.78 exp(365/T), k2 = 6.28 exp(215/T), and k3 = 1.91 exp(215/T). The accuracy of reported rate coefficients is estimated to be 15-25% depending on the magnitude of the rate coefficient and on the temperature. Reaction with atomic oxygen is an important stratospheric loss process for bromine nitrate at altitudes above approximately 25 km; this reaction should be included in models of stratospheric chemistry if bromine partitioning is to be correctly simulated in the 25-35 km altitude regime.
Reaction of O(3P) with ClONO2: Rate coefficients and yield of NO3 product
Goldfarb, Leah,Harwood, Matthew H.,Burkholder, James B.,Ravishankara
, p. 8556 - 8563 (2007/10/03)
The rate coefficient for the reaction O(3P) with ClONO2, k1, was measured between 202 and 325 K using two methods: pulsed laser photolysis with time-resolved atomic resonance fluorescence detection of the O atoms and pulse
Kinetics of the gas-phase reaction of NO3 radicals with 1-butene, trans-rutene, 2-methyl-2-butene and 2,3-dimethyl-2-butene using LIF detection
Berndt,Kind,Karbach
, p. 1486 - 1491 (2008/10/08)
Rate constants for the gas-phase reaction of NO3 radicals with 1-butene, frans-butene, 2-methyl-2-butene and 2,3-dimethyl-2-butene have been obtained in a flow system at 298±2 K and a pressure of 3 mbar He using NO3 LIF measurements. NO3 radicals were produced via thermal decomposition of N2O5 at ca. 400 K, Li.e. N2O5+M → NO3+NO2+M. Applying pseudo-first-order conditions, the rate constants for 1-butene and trans-butene were found to be (1.04±0.11)·10-14 and (3.74±0.45)·10-13, respectively. For 2-methyl-2-butene and 2,3-dimethyl-2-butene the rate constants were obtained under second-order conditions to be (1.03±0.09)·10-11 and (5.49±0.42)·10-11, respectively (unit: cm3 molecule-1 s-1). WILEY-VCH Verlag GmbH, 1998.
Measurement of Rate Coefficients for the Unimolecular Decomposition of N2O5
Cantrell, Christopher A.,Shetter, Richard E.,Calvert, Jack G.,Tyndall, Geoffrey S.,Orlando, John J.
, p. 9141 - 9148 (2007/10/02)
The kinetics of the decomposition of dinitrogen pentoxide (N2O5) in the presence of excess nitric oxide (NO) in a bath of nitrogen was studied as a function of temperature and pressure using Fourier transform infrared spectroscopy to monitor the N2O5 concentration.The available data encompassing temperatures from 253 to 384 K and third-body concentrations from 4.3 x 1E14 to 1.1 x 1E20 molecule-3 have been analyzed, although rate coefficients over the entire range of pressure have not been measured at all temperatures.The following recommendations are made to fir parameters to the Troe expresssion for k(N2O5 + M): k0,2 = 1.04 x 1E-3(T/300)-3.5 exp(-11000/T) cm3 molecule-1 s-1, k,2 = 6.22 x 1E14(T/300)-0.2 exp(-11000/T)s-1, Fc = 2.5 exp(-1950/T) + 0.9 exp(-T/430).These parameters, when combined with data for k(NO2 + NO3 + M), yield N2O5 equilibrium constant values systematically higher than recent evaluations of direct measurements by 19-37percent but closer to earlier measurements.With these new recommendations, calculated atmospheric decomposition lifetimes for N2O5 are decreased slightly (ca.15percent to 20percent), compared to current ones, at ground level and in the upper stratosphere.
Kinetic Study of the Reaction OD + DNO3 -> D2O + NO3
Singleton, Donald L.,Paraskevopoulos, George,Irwin, Robert S.
, p. 694 - 697 (2007/10/02)
Rate constants for the reaction of OD radicals with DNO3 have been determined in the temperature range 269-446 K by a flash photolysis-resonance absorption technique.OD radicals were generated by photolysis of DNO3 at 222 nm with a KrCl excimer laser and
Laboratory studies of the reactions of the nitrate radical with chloroform, methanol, hydrogen chloride and hydrogen bromide
Canosa-Mas, Carlos E.,Smith, Stuart J.,Toby, Sidney,Wayne, Richard P.
, p. 709 - 726 (2008/10/08)
Arrhenius parameters have been measured over the temperature range 298-523 K for the hydrogen abstraction reactions of NO3 with CH3OH, CHCl3 and HCl. A rate constant was determined at room temperature for the reaction of NO3 with HBr. Kinetic data were obtained by the discharge-flow technique operating at total pressures between 1.8 and 5.2 mmHg. The rate expression derived for the interactions with CH3OH, CHCl3 and HCl are 1.2 x 10-12 exp (-2560/T), 8.6 x 10-13 exp (-2815/T), and 4.0 x 10-12 exp (-3330/T) cm3 molecule-1 s-1. For the reaction of NO3 with HBr, the rate constant is 1.3 x 10-16 cm3 molecule-1 s-1 at 298 K. The hydrogen-abstraction reactions of NO3 are compared with those of O(3P) and OH.
