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Showing 1–16 of 16 results
Advanced filters: Author: Armin Hansel Clear advanced filters

  • Experiments performed in the CERN CLOUD chamber show that, under upper-tropospheric conditions, new atmospheric particle formation may be initiated by the reaction of hydroxyl radicals with isoprene emitted by rainforests.

    • Jiali Shen
    • Douglas M. Russell
    • Xu-Cheng He
    ResearchOpen Access
    Nature
    Volume: 636, P: 115-123

  • Measurements in the CLOUD chamber at CERN show that the rapid condensation of ammonia and nitric acid vapours could be important for the formation and survival of new particles in wintertime urban conditions, contributing to urban smog.

    • Mingyi Wang
    • Weimeng Kong
    • Neil M. Donahue
    ResearchOpen Access
    Nature
    Volume: 581, P: 184-189

  • Iodic acid (HIO3) forms aerosols very efficiently, but its gas-phase formation mechanism is not well understood. Atmospheric simulation chamber experiments, quantum chemical calculations and kinetic modelling have now revealed that HIO3 forms as an early iodine oxidation product from hypoiodite. The mechanism explains field measurements and suggests a catalytic role for iodine in particle formation.

    • Henning Finkenzeller
    • Siddharth Iyer
    • Rainer Volkamer
    ResearchOpen Access
    Nature Chemistry
    Volume: 15, P: 129-135

  • Atmospheric organic compounds are central to key chemical processes that influence air quality. Concurrent measurements of a wide range of these compounds, including previously unmeasured ones, provide closure on OH reactivity.

    • James F. Hunter
    • Douglas A. Day
    • Jesse H. Kroll
    Research
    Nature Geoscience
    Volume: 10, P: 748-753

  • The growth rates of freshly formed aerosol particles influence what fraction of these can reach sizes large enough to affect cloud formation and climate. Here, the authors show that the nano-particle growth in a sulphuric acid containing system can be enhanced by the presence of ions or small acid-base clusters.

    • Katrianne Lehtipalo
    • Linda Rondo
    • Markku Kulmala
    ResearchOpen Access
    Nature Communications
    Volume: 7, P: 1-9

  • The growth of nucleated organic particles has been investigated in controlled laboratory experiments under atmospheric conditions; initial growth is driven by organic vapours of extremely low volatility, and accelerated by more abundant vapours of slightly higher volatility, leading to markedly different modelled concentrations of atmospheric cloud condensation nuclei when this growth mechanism is taken into account.

    • Jasmin Tröstl
    • Wayne K. Chuang
    • Urs Baltensperger
    ResearchOpen Access
    Nature
    Volume: 533, P: 527-531

  • Aerosol particles can form in the atmosphere by nucleation of highly oxidized biogenic vapours in the absence of sulfuric acid, with ions from Galactic cosmic rays increasing the nucleation rate by one to two orders of magnitude compared with neutral nucleation.

    • Jasper Kirkby
    • Jonathan Duplissy
    • Joachim Curtius
    ResearchOpen Access
    Nature
    Volume: 533, P: 521-526

  • Isoprene oxidation products are deposited rapidly into poplar leaves, where they undergo detoxification, and up to 1.5% are reemitted to the atmosphere as methyl ethyl ketone, according to laboratory and field experiments and chemistry-transport model simulations.

    • Eva Canaval
    • Dylan B. Millet
    • Armin Hansel
    ResearchOpen Access
    Communications Earth & Environment
    Volume: 1, P: 1-9

  • Isoprene is a key compound emitted into the atmosphere, which reacts rapidly with hydroxyl radicals and contributes to aerosol formation. Here the authors conduct flow tube measurements to observe the early stages of isoprene oxidation product formation in low hydroperoxy radical and nitric oxide environments.

    • Torsten Berndt
    • Noora Hyttinen
    • Armin Hansel
    ResearchOpen Access
    Communications Chemistry
    Volume: 2, P: 1-10