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Molecular dIffusion of organiCs in secondaRy Organic aeroSols and impaCts On Particle chEmistry

Total Cost €


EC-Contrib. €






 MICROSCOPE project word cloud

Explore the words cloud of the MICROSCOPE project. It provides you a very rough idea of what is the project "MICROSCOPE" about.

particles    parametrizations    models    output    reached    parametrization    verify    molecules    cloud    degradation    organics    goals    relate    tropospheric    recovery    water    estimate    diffusion    rates    tube    molecular    simultaneous    rectangular    size    america    of    measuring    fluorescence    lt    predictions    climate    times    model    temperatures    air    microscopy    despite    controls    coefficients    mass    secondary    derive    function    experimental    ray    290    small    facilities    groups    situ    photobleaching    resolution    area    chemical    dependent    diffusivity    atmospheric    temperature    quality    determined    innovative    flow    training    action    soa    microscope    particle    north    cell    instrumentation    experiments    chemistry    spectrometry    largely    composition    missing    impacts    combining    aw    reactivity    combination    peroxides    scientific    aerosol    laboratory    samples    expertise    mixing    ones    organic    class   

Project "MICROSCOPE" data sheet

The following table provides information about the project.


Organization address
postcode: 5232

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country Switzerland [CH]
 Total cost 247˙606 €
 EC max contribution 247˙606 € (100%)
 Programme 1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
 Code Call H2020-MSCA-IF-2019
 Funding Scheme MSCA-IF-GF
 Starting year 2020
 Duration (year-month-day) from 2020-08-01   to  2023-07-31


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    PAUL SCHERRER INSTITUT CH (VILLIGEN PSI) coordinator 247˙606.00


 Project objective

Molecular diffusion of organics within secondary organic aerosol (SOA), a main class of tropospheric particles, controls predictions of particle mass, size, mixing state, and cloud formation properties, thus SOA’s role for air quality, atmospheric chemistry and climate. Despite that, measurements of diffusion coefficients of organics in SOA at low, tropospheric relevant temperatures (T) are largely missing. The objectives of MICROSCOPE are to directly measure diffusion coefficients of organic molecules in SOA particles at T < 290 K, improve parametrizations used to estimate diffusion, test predictions of diffusivity in atmospheric models and assess the impacts on particle chemistry, by the combination of development of innovative instrumentation, experimental and modelling work. Measuring diffusion coefficients as a function of water activity (aw) and temperature, will be achieved by developing a new flow cell with simultaneous and in-situ T and aw-control for rectangular area fluorescence recovery after photobleaching measurements. The chemical composition of the SOA samples will be determined using high-resolution mass spectrometry, with the goal to improve existing parametrizations used to estimate the diffusion of organics in SOA and derive new ones that directly relate chemical composition to diffusion coefficients. The new T and aw-dependent parametrization will be used along with model output to verify if tropospheric mixing times of organics in SOA particles are < 1 h. Finally, the impact of diffusion of organics on SOA particle reactivity and chemistry will be determined through measuring the degradation rates of peroxides within SOA particles, using aerosol flow tube and X-ray microscopy experiments. By combining the expertise of two research groups in North America and Europe, state-of-the-art laboratory facilities, and small and large-scale instrumentation, both the scientific as well as the training goals of this action will be reached.

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