12033-49-7Relevant academic research and scientific papers
Chlorine Nitrate Photochemistry. Photolysis Products and Kinetics of the Reaction Cl + ClONO2 -> Cl2 + NO3
Margitan, James J.
, p. 674 - 679 (1983)
The photolysis of chlorine nitrate was studied at 266 and 355 nm by using atomic resonance fluorescence detection of the primary products (O and Cl).The major photolysis route is to Cl + NO3 (Φ1=0.90) with the O + ClONO channel accounting for Φ2=0.10.The kinetics of the reaction Cl + ClONO2 -> Cl2 + NO3 (k4) were studied over the temperature range 219-298 K.In Arrhenius form, K4(T)=6.3 x 10-12 exp(150/T).The value k4(298)=1.04 x 10-11 cm3 s-1 is a factor of 50 faster than previously reported.A possible error in the prior kinetics study is identified, and the divergent results of earlier quantum yield studies are reconciled.
Kinetics of the Reactions of F(2P) and Cl(2P) with HNO3
Wine, P. H.,Wells, J. R.,Nicovich, J. M.
, p. 2223 - 2228 (1988)
The kinetics of the reactions of HNO3 with fluorine (k1) and chlorine (k2) atoms have been studied by using a time-resolved long-path laser absorption technique to monitor the appearence of product NO3 radicals following 351-nm pulsed laser photolysis of X2/HNO3/He mixtures (X = F, Cl).Absolute rate coefficients for the F(2P) + HNO3 reaction have been determined over the temperature range 260-373 K.Between 260 and 320 K, the data are adequately represented by the Arrhenius expression k1(T) = (6.0 +/- 2.6)*10-12 exp cm3 molecule-1 s-1.Bet ween 335 and 373 K, the rate coefficient is found to be (2.0 +/- 0.3)*10-11 cm3 molecule-1 s-1 independent of temperature.The observed temperature dependence suggests that reaction proceeds via competing direct abstraction and complex pathways.No NO3 production was observed in the experiments with X = Cl, thus establishing that k2(298 K) -16 cm3 molecule-1 s-1.The Cl(2P) + HNO3 reaction was also investigated by using a pulsed laser photolysis-resonance fluorescence technique to monitor the decay of Cl(2P).Upper limit values for k2 obtained from these experiments, in units of 10-16 cm3 molecule-1 s-1, are 13 at 298 K and 10 at 400 K.
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 (1998)
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
Kinetic Study of the Reaction OD + DNO3 -> D2O + NO3
Singleton, Donald L.,Paraskevopoulos, George,Irwin, Robert S.
, p. 694 - 697 (1991)
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
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.
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.
