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Your search keyword '"DeMore, W.B."' showing total 18 results
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18 results on '"DeMore, W.B."'

1. Atmospheric chemistry of CF3OCF2CF2H and CF3OC(CF3)2H: Reaction with Cl atoms and OH radicals, degradation mechanism, global warming potentials, and empirical relationship between k(OH) and k(Cl) for organic compound

Author

Andersen, M.P. Sulbaek, Nielsen, O.J., Wallington, T.J., Hurley, M.D., and DeMore, W.B.

Subjects
Radicals (Chemistry) -- Observations, Atmospheric chemistry -- Observations, Chlorine compounds -- Chemical properties, Chlorine compounds -- Atomic properties, Chemicals, plastics and rubber industries
Abstract

The kinetics data for reactions of Cl and OH with CF3OCF2CF2H and CF3OC(CF3)2H is measured. The results revealed that OH radicals are 8 and 206 times more reactive than Cl atoms toward CF3OCF2CF2H and CF3OC(CF3)2H respectively.

Published
2005

2. Rate constants for the reactions of hydroxyl radical with several alkanes, cycloalkanes, and dimethyl ether

Author

DeMore, W.B. and Bayes, K.D.

Subjects
Chemical reaction, Rate of -- Research, Alkanes -- Research, Cyclic compounds -- Research, Methyl ether -- Research, Radicals (Chemistry) -- Research, Hydroxylation -- Research, Chemicals, plastics and rubber industries
Abstract

The rate constants for the reactions of OH with propane, n-butane, n-hexane, cyclopropane, cyclobutane, cyclohexane, cyclopentane and dimethyl ether were investigated. A persistent discrepancy was observed between absolute and relative rate measurements in the low temperature regime. Results also suggested that relative rate constant values can be used in simple Arrhenius expressions.

Published
1999

3. Rate constant and temperature dependence for the reaction of hydroxyl radicals with 2-fluoropropane (HFC-281ea)

Author

DeMore, W.B. and Wilson, Edmond W., Jr.

Subjects
Radicals (Chemistry) -- Research, Temperature measurements -- Analysis, Chemical reaction, Rate of -- Measurement, Infrared spectroscopy -- Usage, Gas chromatography -- Usage, Chemicals, plastics and rubber industries
Abstract

Research was conducted to examine the temperature dependence and rate constant of the reaction of hydroxyl radicals with 2-fluoropropane (HFC-281ea) through relative rate experiments. Propane, ethane and ethyl chloride were used as reference standards while gas chromatography and infrared spectroscopy were used for the calculations. Results based on the two approaches were in good agreement except that the gas chromatography data were more precise.

Published
1999

4. Experimental and Estimated Rate Constants for the Reactions of Hydroxyl Radicals with Several Halocarbons

Author

DeMore, W.B

Subjects
Inorganic And Physical Chemistry
Abstract

Relative rate experiments are used to measure rate constants and temperature dependencies of the reactions of OH with CH3F (41), CH2FCl (31), CH2BrCl (30B1), CH2Br2 (3OB2), CHBr3 (2OB3), CF2BrCHFCl (123aBl(alpha)), and CF2ClCHCl2 (122). Rate constants for additional compounds of these types are estimated using an empirical rate constant estimation method which is based on measured rate constants for a wide range of halocarbons. The experimental data are combined with the estimated and previously reported rate constants to illustrate the effects of F, Cl, and Br substitution on OH rate constants for a series of 19 halomethanes and 25 haloethanes. Application of the estimation technique is further illustrated for some higher hydrofluorocarbons (HFCs), including CHF2CF2CF2CF2H (338pcc), CF3CHFCHFCF2CF3 (43-10mee), CF3CH2CH2CF3 (356ffa), CF3CH2CF2CH2CF3 (458mfcf), CF3CH2CHF2 (245fa), and CF3CH2CF2CH3 (365mfc). The predictions are compared with literature data for these compounds.

Published
1996
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5. Experimental and Estimated Rate Constants for the Reactions of Hydroxyl Radicals With Several Halocarbons

Author

DeMore, W.B

Abstract

Relative rate experimental data are used to derive rate constants and temperature dependencies of the reactions of OH with several halocarbons. Rate constants for additional similar compounds are estimated. The experimental data, estimated data, and previously reported data are used to illustrate the effects of F, CL and Br substitution on OH rate constants for a series of 19 halomethanes and 25 haloethanes, as well as some higher HFCs.

Published
1995

8. Atmospheric Chemistry and Greenhouse Gases

Author

Ehhalt, D., Prather, M., Dentener, F., Derwent, R., Dlugokencky, E., Holland, E., Isaksen, I., Katima, J., Kirchhoff, V., Matson, P., Midgley, P., Wang, M., Berntsen, T., Bey, I., Brasseur, G., Buja, L., Collins, W.J., Daniel, J., DeMore, W.B., Derek, N., Dickerson, R., Etheridge, D., Feichter, J., Fraser, P., Friedl, R., Fuglestvedt, J., Gauss, M., Grenfell, L., Grübler, A., Harris, N., Hauglustaine, D., Horowitz, L., Jackman, C., Jacob, D., Jaeglé, L., Jain, A., Kanakidou, M., Karlsdottir, S., Ko, M., Kurylo, M., Lawrence, M., Logan, J.A., Manning, M., Mauzerall, D., Mcconnell, J., Mickley, L., Montzka, S., Müller, J.F., Olivier, J., Pickering, K., Pitari, G., Roelofs, G.J., Rogers, H., Rognerud, B., Smith, S., Solomon, S., Staehelin, J., Steele, P., Stevenson, D., Sundet, J., Thompson, A., Van Weele, M, Von Kuhlmann, R, Wang, Y., Weisenstein, D., Wigley, T., Wild, O., Wuebbles, D., Yantosca, R., Joos, F, Mcfarland, M, Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Modelling the Earth Response to Multiple Anthropogenic Interactions and Dynamics (MERMAID), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, 2 Trace Gases: Current Observations, 2 Atmospheric measurements and modelling of photochemistry 264, 6 Tropospheric OH and Photochemical Modelling 263 4, 1 Non-CO 2 Kyoto Gases 248 4, 1 Laboratory data and the OH lifetime of greenhouse gases 263 4, 1 Methane (CH 4 ) 248 4, 3 Reactive Gases 256 4, 3 Hydrofluorocarbons (HFCs) 253 4, 4 Tropospheric O 3 260 4, 5 Stratospheric H 2 O 263 4, 2 Nitrous oxide (N 2 O) 251 4, 3 Nitrogen oxides (NO x ) 259 4, 2 Montreal Protocol Gases and Stratospheric Ozone (O 3 ) 255 4, 1 Carbon monoxide (CO) and hydrogen (H 2 ) 256 4, Trends and Budgets 248 4, 2 Volatile organic compounds (VOC) 257 4, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, 4 Perfluorocarbons (PFCs) and sulphur hexafluoride (SF 6 ) 254 4, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2001

10. Rate constant for the reaction of atomic bromine with ozone

Author

Leu, M.-T. and Demore, W.B.

Abstract

The rate constant for the reaction Br + O3→ BrO + O2has been measured over the temperature range 224 to 422 K in a discharge flow system using a mass spectrometer as a detector. Results, expressed in the form k1= (3.34 ± 0.40) × 10−11X exp[−(978 ± 36)/T] cm3s−1, are compared with previous measurements.

Published
1977
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