Tatjana Müller
A5070690236- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Air Quality and Health Impacts
- Adsorption, diffusion, and thermodynamic properties of materials
- Dark Matter and Cosmic Phenomena
- Indoor Air Quality and Microbial Exposure
- Mass Spectrometry Techniques and Applications
- Solar and Space Plasma Dynamics
- Atrial Fibrillation Management and Outcomes
- Cardiac electrophysiology and arrhythmias
- Industrial Gas Emission Control
- ECG Monitoring and Analysis
- Radioactivity and Radon Measurements
- Air Quality Monitoring and Forecasting
- Radioactive element chemistry and processing
- Analytical chemistry methods development
- Nanoparticles: synthesis and applications
- Graphite, nuclear technology, radiation studies
- Catalytic Processes in Materials Science
- Advanced Chemical Physics Studies
- Photochemistry and Electron Transfer Studies
- Radiation Therapy and Dosimetry
- Chemistry and Chemical Engineering
Max Planck Institute for Chemistry
2021-2024
University Hospital of Basel
2023
Goethe University Frankfurt
2019-2023
University of Basel
2023
A list of authors and their affiliations appears at the end paper New-particle formation is a major contributor to urban smog1,2, but how it occurs in cities often puzzling3. If growth rates particles are similar those found cleaner environments (1-10 nanometres per hour), then existing understanding suggests that new should be rapidly scavenged by high concentration pre-existing particles. Here we show, through experiments performed under atmospheric conditions CLOUD chamber CERN, below...
Faster than expected Iodine species are one of only a handful atmospheric vapors known to make new aerosol particles, which play central role in controlling the radiative forcing climate. He et al. report experimental evidence from CERN Cosmics Leaving Outdoor Droplets, or CLOUD, chamber demonstrating that iodic acid and iodous rapidly form particles can compete with sulfuric pristine regions. Science , this issue p. 589
Abstract. In the present-day atmosphere, sulfuric acid is most important vapour for aerosol particle formation and initial growth. However, growth rates of nanoparticles (<10 nm) from remain poorly measured. Therefore, effect stabilizing bases, contribution ions impact attractive forces on molecular collisions are under debate. Here, we present precise rate measurements uncharged particles 1.8 to 10 nm, performed atmospheric conditions in CERN (European Organization Nuclear Research)...
Abstract. Nucleation of atmospheric vapours produces more than half global cloud condensation nuclei and so has an important influence on climate. Recent studies show that monoterpene (C10H16) oxidation yields highly oxygenated products can nucleate with or without sulfuric acid. Monoterpenes are emitted mainly by trees, frequently together isoprene (C5H8), which the highest emission all organic vapours. Previous have shown suppresses new-particle formation from monoterpenes, but cause this...
Abstract New particle formation in the upper free troposphere is a major global source of cloud condensation nuclei (CCN) 1–4 . However, precursor vapours that drive process are not well understood. With experiments performed under tropospheric conditions CERN CLOUD chamber, we show nitric acid, sulfuric acid and ammonia form particles synergistically, at rates orders magnitude faster than those from any two three components. The importance this mechanism depends on availability ammonia,...
Dimethyl sulfide (DMS) influences climate via cloud condensation nuclei (CCN) formation resulting from its oxidation products (mainly methanesulfonic acid, MSA, and sulfuric H2SO4). Despite their importance, accurate prediction of MSA H2SO4 DMS remains challenging. With comprehensive experiments carried out in the Cosmics Leaving Outdoor Droplets (CLOUD) chamber at CERN, we show that decreasing temperature +25 to −10 °C enhances gas-phase production by an order magnitude OH-initiated...
Ozone reaction with human surfaces is an important source of ultrafine particles indoors. However, 1–20 nm generated from ozone–human chemistry, which mark the first step particle formation and growth, remain understudied. Ventilation indoor air movement could have implications for these processes. Therefore, in a controlled-climate chamber, we measured initiated chemistry their dependence on change rate (ACR, 0.5, 1.5, 3 h–1) operation mixing fans (on off). Concurrently, volatile organic...
Abstract Iodine is a reactive trace element in atmospheric chemistry that destroys ozone and nucleates particles. emissions have tripled since 1950 are projected to keep increasing with rising O 3 surface concentrations. Although iodic acid (HIO ) widespread forms particles more efficiently than sulfuric acid, its gas-phase formation mechanism remains unresolved. Here, CLOUD simulation chamber experiments generate iodine radicals at atmospherically relevant rates, we show iodooxy hypoiodite,...
Humans are known to be a continuous and potent indoor source of volatile organic compounds (VOCs). However, little is about how personal hygiene, in terms showering frequency, can influence these emissions their impact on air chemistry involving ozone. In this study, we characterized the VOC composition controlled climate chamber (22.5 m3 with an change rate at 3.2 h–1) occupied by four male volunteers successive days under ozone-free (∼0 ppb) ozone-present (37–40 conditions. The either...
Abstract. Here we describe the design and performance of a new water cluster chemical ionization–atmospheric pressure interface time-of-flight mass spectrometer (CI-APi-TOF). The instrument selectively measures trace gases with high proton affinity such as ammonia dimethylamine, which are important for atmospheric particle formation growth. Following description characterization, demonstrate successful measurements at CERN CLOUD (Cosmics Leaving OUtdoor Droplets) chamber where very low...
Abstract. Biogenic organic precursors play an important role in atmospheric new particle formation (NPF). One of the major precursor species is α-pinene, which upon oxidation can form a suite products covering wide range volatilities. Highly oxygenated molecules (HOMs) comprise fraction formed. While it known that HOMs contribute to secondary aerosol (SOA) formation, including NPF, they have not been well studied newly formed particles due their very low mass concentrations. Here we present...
Personal care products (PCPs) contain diverse volatile organic compounds (VOCs) and routine use of PCPs indoors has important implications for indoor air quality human chemical exposures. This chamber study deployed aerosol instrumentation two online mass spectrometers to quantify VOC emissions from the five fragranced examined formation gas-phase oxidation particles upon ozone-initiated reactive VOCs. The tested include a perfume, roll-on deodorant, body spray, hair hand lotion. Indoor...
Abstract. In the present-day atmosphere, sulfuric acid is most important vapour for aerosol particle formation and initial growth. However, growth rates of nanoparticles (
Abstract. Aerosol particles have an important role in Earth's radiation balance and climate, both directly indirectly through aerosol–cloud interactions. Most aerosol the atmosphere are weakly charged, affecting their collision rates with ions neutral molecules, as well by which they scavenged other cloud droplets. The rate coefficients between since determine growth lifetimes of charged particles, so may influence microphysics, dynamics, processing. However, despite importance, very few...
Abstract. Currently, the complete chemical characterization of nanoparticles (< 100 nm) represents an analytical challenge, since these particles are abundant in number but have negligible mass. Several methods for particle-phase been recently developed to better detect and infer more accurately sources fates sub-100 nm particles, a detailed comparison different approaches is missing. Here we report on composition secondary organic aerosol (SOA) from experimental studies α-pinene...
Abstract. Nucleation of atmospheric vapors produces more than half global cloud condensation nuclei and so has an important influence on climate. Recent studies show that monoterpene (C10H16) oxidation yields highly-oxygenated products can nucleate with or without sulfuric acid. Monoterpenes are emitted mainly by trees, frequently together isoprene (C5H8), which the highest emission all organic vapors. Previous have shown suppresses new-particle formation from monoterpenes, but cause this...
Abstract. A new water cluster Chemical Ionization-Atmospheric Pressure interface-Time Of Flight mass spectrometer (CI-APi-TOF) is introduced. The instrument designed for the selective measurement of trace gases with high proton affinity, such as ammonia, amines, and diamines that are, example, relevant atmospheric particle formation. Following description characterization, we demonstrate successful measurements at CLOUD (Cosmics Leaving OUtdoor Droplets) chamber where very low ammonia...
Abstract. Currently, the complete chemical characterization of nanoparticles (<100 nm) represents an analytical challenge, since these particles are abundant in number but have negligible mass. Several methods for particle-phase been recently developed to better detect and infer more accurately sources fates ultra-fine particles, a detailed comparison different approaches is missing. Here we report on composition secondary organic aerosol (SOA) from experimental studies α-pinene...
Abstract. Aerosol particles have an important role in Earth’s radiation balance and climate, both directly indirectly through aerosol–cloud interactions. Most aerosol the atmosphere are weakly charged, affecting their collision rates with ions neutral molecules, as well by which they scavenged other cloud droplets. The rate coefficients between since determine growth lifetimes of charged particles, so may influence dynamics processing. However, despite importance, very few experimental...
Abstract. New Particle Formation (NPF) from biogenic organic precursors is an important atmospheric process. One of the major species α-pinene, which upon oxidation, can form a suite products covering wide range volatilities. A fraction oxidation termed Highly Oxygenated Organic Molecules (HOM). These play crucial role for nucleation and formation Secondary Aerosol (SOA). However, measuring composition newly formed particles challenging due to their very small mass. Here, we present results...