Absolute rate constant for the reaction OH (v=0)+O3→HO2 +O2 over the temperature range 238–357 °K

1979 ◽  
Vol 70 (2) ◽  
pp. 984 ◽  
Author(s):  
A. R. Ravishankara ◽  
P. H. Wine ◽  
A. O. Langford
Keyword(s):  
Rate Constant ◽  
Absolute Rate ◽  
Temperature Range ◽  
Absolute Rate Constant

scholarly journals Erratum: Absolute rate constant for the reaction OH(v=0)+O3→HO2+O2 over the temperature range 238–357° K

1979 ◽  
Vol 70 (10) ◽  
pp. 4812-4812
Author(s):  
A. R. Ravishankara ◽  
P. H. Wine ◽  
A. O. Langford
Keyword(s):  
Rate Constant ◽  
Absolute Rate ◽  
Temperature Range ◽  
Absolute Rate Constant

scholarly journals Absolute rate constant and O(<sup>3</sup>P) yield for the O(<sup>1</sup>D)+N<sub>2</sub>O reaction in the temperature range 227 K to 719 K

2008 ◽  
Vol 8 (20) ◽  
pp. 6261-6272 ◽  
Author(s):  
S. Vranckx ◽  
J. Peeters ◽  
S. A. Carl
Keyword(s):  
Rate Constant ◽  
Rate Constants ◽  
Room Temperature ◽  
Marked Decrease ◽  
Quantum Yields ◽  
Absolute Rate ◽  
Temperature Range ◽  
A Value ◽  
Relative Quantum ◽  
Absolute Rate Constant

Abstract. The absolute rate constant for the reaction that is the major source of stratospheric NOx, O(1D)+N2O → products, has been determined in the temperature range 227 K to 719 K, and, in the temperature range 248 K to 600 K, the fraction of the reaction that yields O(3P). Both the rate constants and product yields were determined using a recently-developed chemiluminescence technique for monitoring O(1D) that allows for higher precision determinations for both rate constants, and, particularly, O(3P) yields, than do other methods. We found the rate constant, kR1, to be essentially independent of temperature between 400 K and 227 K, having a value of (1.37±0.11)×10−10 cm3 s−1, and for temperatures greater than 450 K a marked decrease in rate constant was observed, with a rate constant of only (0.94±0.11)×10−10 cm3 s−1 at 719 K. The rate constants determined over the 227 K–400 K range show very low scatter and are significantly greater, by 20% at room temperature and 15% at 227 K, than the current recommended values. The fraction of O(3P) produced in this reaction was determined to be 0.002±0.002 at 250 K rising steadily to 0.010±0.004 at 600 K, thus the channel producing O(3P) can be entirely neglected in atmospheric kinetic modeling calculations. A further result of this study is an expression of the relative quantum yields as a function of temperature for the chemiluminescence reactions (kCL1)C2H + O(1D) → CH(A) + CO and (kCL2)C2H + O(3P) → CH(A) + CO, both followed by CH(A) → CH(X) + hν, as kCL1(T)/kCL2(T)=(32.8T−3050)/(6.29T+398).

scholarly journals Absolute rate constant for the reaction of atomic chlorine with hydrogen peroxide vapor over the temperature range 265–400 K

1977 ◽  
Vol 67 (8) ◽  
pp. 3533-3536 ◽  
Author(s):  
J.V. Michael ◽  
D.A. Whytock ◽  
J.H. Lee ◽  
W.A. Payne ◽  
L.J. Stief
Keyword(s):  
Hydrogen Peroxide ◽  
Rate Constant ◽  
Absolute Rate ◽  
Temperature Range ◽  
Absolute Rate Constant ◽  
Atomic Chlorine ◽  
Hydrogen Peroxide Vapor

scholarly journals Absolute rate constant and O(<sup>3</sup>P) yield for the O(<sup>1</sup>D)+N<sub>2</sub>O reaction in the temperature range 227 K to 719 K

2008 ◽  
Vol 8 (3) ◽  
pp. 8881-8912 ◽  
Author(s):  
S. Vranckx ◽  
J. Peeters ◽  
S. A. Carl
Keyword(s):  
Rate Constant ◽  
Rate Constants ◽  
Room Temperature ◽  
Marked Decrease ◽  
Quantum Yields ◽  
Absolute Rate ◽  
Temperature Range ◽  
A Value ◽  
Relative Quantum ◽  
Absolute Rate Constant

Abstract. We have determined, in the temperature range 227 K to 719 K, the absolute rate constant for the reaction O(1D)+N2O → products and, in the temperature range 248 K to 600 K, the fraction of the reaction that yields O(3P). Both the rate constants and product yields were determined using a recently-developed chemiluminescence technique for monitoring O(1D) that allows for higher precision determinations for both rate constants, and, particularly, O(3P) yields, than do other methods. We found the rate constant, kR1, to be essentially independent of temperature between 400 K and 227 K, having a value of (1.37±0.09)×10−10 cm3 s−1. For temperatures greater than 450 K a marked decrease in value was observed, with a rate constant of only (0.94±0.11)×10−10 cm3 s−1 at 719 K. The rate constants determined over the 227 K–400 K range show very low scatter and are significantly greater, by 20% at room temperature and by 15% at 227 K, than the current recommended values. The fraction of O(3P) produced in this reaction was determined to be 0.002±0.002 at 250 K rising steadily to 0.010±0.004 at 600 K, thus the channel producing O(3P) can be entirely neglected in atmospheric kinetic modeling calculations. A further result of this study is an expression of the relative quantum yields as a function of temperature for the chemiluminescence reactions (kCL1) C2H+O(1D) → CH(A)+CO and (kCL2) C2H+O(3P) → CH(A)+CO, both followed by CH(A) → CH(X)+hν, as kCL1(T)/kCL2(T)=(32.8T−3050)/(6.29T+398).

Absolute rate constant for the reaction of atomic hydrogen with phosphine over the temperature range 209 to 495 K

1976 ◽  
Vol 65 (8) ◽  
pp. 3280-3283 ◽  
Author(s):  
J. H. Lee ◽  
J. V. Michael ◽  
W. A. Payne ◽  
D. A. Whytock ◽  
L. J. Stief
Keyword(s):  
Rate Constant ◽  
Atomic Hydrogen ◽  
Absolute Rate ◽  
Temperature Range ◽  
Absolute Rate Constant

Absolute rate constant for the reaction OH + HBr → H2O + Br

1979 ◽  
Vol 63 (3) ◽  
pp. 479-484 ◽  
Author(s):  
A.R. Ravishankara ◽  
P.H. Wine ◽  
A.O. Langford
Keyword(s):  
Rate Constant ◽  
Absolute Rate ◽  
Absolute Rate Constant
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