Measurement of Absolute Unimolecular and Bimolecular Rate Constants for CH<sub>3</sub>CHOO Generated by the <i>trans</i>-2-Butene Reaction with Ozone in the Gas Phase
作者:Jill D. Fenske、Alam S. Hasson、Andy W. Ho、Suzanne E. Paulson
DOI:10.1021/jp0016636
日期:2000.11.1
span 2−6 orders of magnitude, depending on the reaction partner. Using an atmospheric pressure flow reactor, we have made the first absolute rate coefficient determinations for reactions of a thermalized Criegee intermediate, measuring rates for unimolecular decomposition and reaction with acetaldehyde. For the thermalized CH3CHOO formed in trans-2-butene ozonolysis, values for kdec = 76 s-1 and kald
Direct Measurements of Conformer-Dependent Reactivity of the Criegee Intermediate CH
<sub>3</sub>
CHOO
作者:Craig A. Taatjes、Oliver Welz、Arkke J. Eskola、John D. Savee、Adam M. Scheer、Dudley E. Shallcross、Brandon Rotavera、Edmond P. F. Lee、John M. Dyke、Daniel K. W. Mok、David L. Osborn、Carl J. Percival
DOI:10.1126/science.1234689
日期:2013.4.12
monitored in the laboratory. Su et al. (p. 174; see the Perspective by Vereecken) have obtained its vibrational spectrum, which could ultimately enable direct measurements of itsreactivity in the atmosphere. Taatjes et al. (p. 177; see the Perspective by Vereecken) report on the laboratory preparation and reactivity of the next heavier Criegee intermediate, which bears a methyl group in place of one of the
Stereochemical effects in the ozonolysis of (E)- and (Z)-1-ethoxypropene
作者:Brenda J. Wojciechowski、William H. Pearson、Robert L. Kuczkowski
DOI:10.1021/jo00262a027
日期:1989.1
Rate Coefficients of C1 and C2 Criegee Intermediate Reactions with Formic and Acetic Acid Near the Collision Limit: Direct Kinetics Measurements and Atmospheric Implications
作者:Oliver Welz、Arkke J. Eskola、Leonid Sheps、Brandon Rotavera、John D. Savee、Adam M. Scheer、David L. Osborn、Douglas Lowe、A. Murray Booth、Ping Xiao、M. Anwar H. Khan、Carl J. Percival、Dudley E. Shallcross、Craig A. Taatjes
DOI:10.1002/anie.201400964
日期:2014.4.25
Ratecoefficients are directly determined for the reactions of the Criegeeintermediates (CI) CH2OO and CH3CHOO with the two simplest carboxylic acids, formicacid (HCOOH) and aceticacid (CH3COOH), employing two complementary techniques: multiplexed photoionization mass spectrometry and cavity‐enhanced broadband ultraviolet absorption spectroscopy. The measured ratecoefficients are in excess of 1×10−10 cm3 s−1
Criegee 中间体 (CI) CH 2 OO 和 CH 3 CHOO 与两种最简单的羧酸甲酸 (HCOOH) 和乙酸 (CH 3 COOH)反应的速率系数直接确定,采用两种互补技术:多重光电离质谱和腔增强宽带紫外吸收光谱。测得的速率系数超过1×10 -10 cm 3 s -1,比许多以前的烯烃臭氧分解实验所建议的和大气模型研究中假设的要大几个数量级。这些结果表明,与目前假设的相比,与羧酸的反应对于 CI 来说是一个更重要的损失过程。在全球大气模型中实施这些速率系数表明,CI 和有机酸之间的反应对陆地赤道地区和其他高 CI 浓度地区(如高北纬地区)的这些酸的去除做出了重大贡献,并暗示酸的来源在这些领域比以前认识到的要大。