Absorption Cross Sections and Self-Reaction Kinetics of the IO Radical

1997 ◽  
Vol 101 (5) ◽  
pp. 853-863 ◽  
Author(s):  
Matthew H. Harwood ◽  
James B. Burkholder ◽  
Martin Hunter ◽  
R. W. Fox ◽  
A. R. Ravishankara
Keyword(s):  
Reaction Kinetics ◽  
Cross Sections ◽  
Absorption Cross ◽  
Kinetics Of

scholarly journals Absorption cross sections and kinetics of formation of AlO at 298 K

2017 ◽  
Vol 675 ◽  
pp. 56-62 ◽  
Author(s):  
Juan Carlos Gómez Martín ◽  
Shane M. Daly ◽  
James S.A. Brooke ◽  
John M.C. Plane
Keyword(s):  
Cross Sections ◽  
Absorption Cross ◽  
Kinetics Of Formation ◽  
Kinetics Of

scholarly journals CH2OO Criegee intermediate UV absorption cross-sections and kinetics of CH2OO + CH2OO and CH2OO + I as a function of pressure

2020 ◽  
Vol 22 (17) ◽  
pp. 9448-9459 ◽  
Author(s):  
Zara S. Mir ◽  
Thomas R. Lewis ◽  
Lavinia Onel ◽  
Mark A. Blitz ◽  
Paul W. Seakins ◽  
...  
Keyword(s):  
Cross Sections ◽  
Uv Absorption ◽  
Absorption Cross ◽  
Kinetics Of

The UV absorption cross-sections of the Criegee intermediate CH2OO, and kinetics of the CH2OO self-reaction and the reaction of CH2OO with I are reported as a function of pressure at 298 K.

Kinetics of the gas phase reaction OH + NO(+M)→HONO(+M) and the determination of the UV absorption cross sections of HONO

1997 ◽  
Vol 272 (5-6) ◽  
pp. 383-390 ◽  
Author(s):  
Palle Pagsberg ◽  
Erling Bjergbakke ◽  
Emil Ratajczak ◽  
Alfred Sillesen
Keyword(s):  
Gas Phase ◽  
Cross Sections ◽  
Uv Absorption ◽  
Phase Reaction ◽  
Absorption Cross ◽  
Gas Phase Reaction ◽  
Kinetics Of

Gas-phase UV absorption cross-sections and photolysis kinetics of 4-hydroxy-3-hexanone: Atmospheric implications

2017 ◽  
Vol 688 ◽  
pp. 43-46 ◽  
Author(s):  
L. Aslan ◽  
H. Laversin ◽  
E. Roth ◽  
P. Coddeville ◽  
C. Fittschen ◽  
...  
Keyword(s):  
Gas Phase ◽  
Cross Sections ◽  
Uv Absorption ◽  
Absorption Cross ◽  
Kinetics Of

scholarly journals Understanding the kinetics of the ClO dimer cycle

2007 ◽  
Vol 7 (12) ◽  
pp. 3055-3069 ◽  
Author(s):  
M. von Hobe ◽  
R. J. Salawitch ◽  
T. Canty ◽  
H. Keller-Rudek ◽  
G. K. Moortgat ◽  
...  
Keyword(s):  
Cross Sections ◽  
Laboratory Study ◽  
Rate Theory ◽  
Absorption Cross ◽  
Ozone Loss ◽  
Photolysis Rates ◽  
Study Results ◽  
Recombination Rate Constant ◽  
Major Factors ◽  
Kinetics Of

Abstract. Among the major factors controlling ozone loss in the polar vortices in winter/spring is the kinetics of the ClO dimer catalytic cycle. Here, we propose a strategy to test and improve our understanding of these kinetics by comparing and combining information on the thermal equilibrium between ClO and Cl2O2, the rate of Cl2O2 formation, and the Cl2O2 photolysis rate from laboratory experiments, theoretical studies and field observations. Concordant with a number of earlier studies, we find considerable inconsistencies of some recent laboratory results with rate theory calculations and stratospheric observations of ClO and Cl2O2. The set of parameters for which we find the best overall consistency – namely the ClO/Cl2O2 equilibrium constant suggested by Plenge et al. (2005), the Cl2O2 recombination rate constant reported by Nickolaisen et al. (1994) and Cl2O2 photolysis rates based on absorption cross sections in the range between the JPL 2006 assessment and the laboratory study by Burkholder et al. (1990) – is not congruent with the latest recommendations given by the JPL and IUPAC panels and does not represent the laboratory studies currently regarded as the most reliable experimental values. We show that the incorporation of new Pope et al. (2007) Cl2O2 absorption cross sections into several models, combined with best estimates for other key parameters (based on either JPL and IUPAC evaluations or on our study), results in severe model underestimates of observed ClO and observed ozone loss rates. This finding suggests either the existence of an unknown process that drives the partitioning of ClO and Cl2O2, or else some unidentified problem with either the laboratory study or numerous measurements of atmospheric ClO. Our mechanistic understanding of the ClO/Cl2O2 system is grossly lacking, with severe implications for our ability to simulate both present and future polar ozone depletion.

Atmospheric Chemistry of E- and Z-CF3CH═CHF (HFO-1234ze): OH Reaction Kinetics as a Function of Temperature and UV and IR Absorption Cross Sections

2017 ◽  
Vol 121 (43) ◽  
pp. 8322-8331 ◽  
Author(s):  
María Antiñolo ◽  
Iván Bravo ◽  
Elena Jiménez ◽  
Bernabé Ballesteros ◽  
José Albaladejo
Keyword(s):  
Reaction Kinetics ◽  
Cross Sections ◽  
Atmospheric Chemistry ◽  
Ir Absorption ◽  
Absorption Cross

scholarly journals Understanding the kinetics of the ClO dimer cycle

2006 ◽  
Vol 6 (4) ◽  
pp. 7905-7944 ◽  
Author(s):  
M. von Hobe ◽  
R. J. Salawitch ◽  
T. Canty ◽  
H. Keller-Rudek ◽  
G. K. Moortgat ◽  
...  
Keyword(s):  
Equilibrium Constant ◽  
Cross Sections ◽  
Rate Theory ◽  
Theoretical Studies ◽  
Absorption Cross ◽  
Photolysis Rates ◽  
Atmospheric Data ◽  
Recombination Rate Constant ◽  
Major Factors ◽  
Kinetics Of

Abstract. Among the major factors controlling ozone loss in the polar winter is the kinetics of the ClO dimer catalytic cycle. The most important issues are the thermal equilibrium between ClO and Cl2O2, the rate of Cl2O2 formation, and the Cl2O2 photolysis rate. All these issues have been addressed in a large number of laboratory, field and theoretical studies, but large discrepancies between individual results exist and a self-consistent set of parameters compatible with field observations of ClO and Cl2O2 has not been identified. Here, we use thermodynamic calculations and unimolecular rate theory to constrain the ClO/Cl2O2 equilibrium constant and the rate constants for Cl2O2 formation and dissociation. This information is used together with available atmospheric data to examine Cl2O2 photolysis rates based on different Cl2O2 absorption cross sections. Good overall consistency is achieved using a ClO/Cl2O2 equilibrium constant recently suggested by Plenge et al. (2005), the Cl2O2 recombination rate constant reported by Nickolaisen et al. (1994) and Cl2O2 photolysis rates based on averaged absorption cross sections that are roughly intermediate between the JPL 2002 assessment and a laboratory study by Burkholder et al. (1990).

scholarly journals Measurements of the Relaxation Kinetics of Photo-Excited Enol Form of Dibenzoylmethane

1985 ◽  
Vol 5 (3) ◽  
pp. 107-117 ◽  
Author(s):  
P. D. Yankov ◽  
S. M. Saltiel ◽  
I. V. Tomov ◽  
P. J. Markov ◽  
I. K. Petkov
Keyword(s):  
Excited State ◽  
Decay Rate ◽  
Cross Sections ◽  
Decay Rates ◽  
Enol Form ◽  
Absorption Cross ◽  
Relaxation Kinetics ◽  
Light Pulses ◽  
Kinetics Of

The decay rate of the excited state of the enol form of dibenzoylmethane (DBM) in different solvents is measured directly using nanosecond light pulses. The observed relaxation kinetics is explained by the formation of three intermediate forms of the excited cis-enol form of DBM. The decay rates of the intermediates and their absorption cross sections for λ = 266 nm are reported too.

Sign in / Sign up

Export Citation Format

Share Document