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The gas-phase ozonolysis of three methylated alkenes, i.e., trans-2,2-dimethyl-3-hexene (22dM3H), trans-2,5-dimethyl-3-hexene (25dM3H), and 4-methyl-1-pentene (4M1P), has been investigated in the presence of sufficient hydroxyl radical scavenger in a laminar flow reactor at ambient temperature (296 ± 2 K) and P = 1 atm of dry air (RH ≤ 5%). Ozone levels in the reactor were monitored by an automatic analyzer. Alkene and gas-phase product concentrations were determined via online sampling either on three-bed adsorbent cartridges followed by thermodesorption and GC/FID-MS analysis or on 2,4-dinitrophenylhydrazine (DNPH) cartridges for subsequent HPLC/UV analysis. Reaction rate coefficients of (3.38 ± 0.12) × 10-17 for 22dM3H and (2.71 ± 0.26) × 10-17 for 25dM3H, both in cm³ molecule-1 s-1 units, have been obtained under pseudo-first-order conditions. Primary carbonyl products have been identified for the three investigated alkenes, and branching ratios are reported. In the case of 4M1P ozonolysis, the yield of a Criegee intermediate was indirectly determined. Kinetics and product study results are compared to those of literature when available. This work represents the first investigation of reaction products in the ozonolysis of 22dM3H, 25dM3H, and 4M1P in a flow reactor. [ABSTRACT FROM AUTHOR]

Key Point: The editors thank the 2021 peer reviewersThe journal received 1581 submitted manuscripts2510 scientists reviewed for the journal in 2021 [ABSTRACT FROM AUTHOR]

Key Point: Appreciation of peer reviewers for 2020 [ABSTRACT FROM AUTHOR]

The editors of Journal of Geophysical Research (JGR): Atmospheres wish to sincerely thank the 2,573 outstanding scientists who reviewed manuscripts for the journal in 2019. Peer review is a crucial process to ensure the integrity and rigor of science. Your reviews have helped to improve the qualities of research by many authors, stimulated new ideas, and impacted the careers of many young scientists. Through these reviews, you contributed not only to the high standard of JGR‐Atmospheres but also to the standing of our scientific discipline. Of the 2,573 reviewers listed below for the 1,757 new papers and 1,358 revised papers submitted to the journal (amounting to a total of 3,115 papers), 491 people reviewed three or more papers. On behalf of the journal, the authors, and the community, we thank all reviewers for your selfless service and dedication to the scientific community. We look forward to your continuing support! Key Point: The editors thank the 2019 peer reviewers [ABSTRACT FROM AUTHOR]