Objective
The atmospheric chemistry of iodine has received much less attention than that of chlorine and bromine but recently a role for iodine in stratospheric ozone depletion has been proposed. It is important to establish quantitatively the chemistry and budgets of atmospheric iodine, so that the influence, if any, of man-made iodine compounds on stratospheric ozone can be assessed. The objective of the LEXIS project is to provide laboratory data needed for this.
A programme of laboratory studies is proposed to provide quantitative kinetic and mechanistic data on the
homogeneous and heterogeneous atmospheric chemistry of iodine species. Experimental measurements of
selected key gas phase reactions involving iodine species will be undertaken and the uptake and reactivity of
iodine species with water ice and sulphuric acid aerosols will be investigated. This approach has been very
successful in determining the ozone depletion potentials of man-made chlorine and bromine gases on the ozone
layer, and is expected to provide the required data base for the assessment of the impact of iodine species.
Studies of the kinetics and branching ratios of a number of homogeneous gas phase reactions of iodine species
will be carried out , over a range of both temperature and pressure, as far as possible. The gas phase reactions
which will be investigated in this study are:
- IO + ClO
- IO + BrO
- IO + O
- IO + HO2
- IO + IO
- I + O3
- OH + HI
- OH + CH3I
- IO + CH3O2
- IONO2 + M
Experimental methods include conventional flow reactors as well as very low pressure reactors with mass
spectrometric and optical detection for the study of reaction kinetics. Pulsed photolysis with time resolved
spectroscopic detection will also be used for radical species. Conventional absorption spectroscopy will be used
to determine absorption cross sections.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences earth and related environmental sciences atmospheric sciences
- natural sciences earth and related environmental sciences environmental sciences ozone depletion
- natural sciences physical sciences optics spectroscopy absorption spectroscopy
- natural sciences chemical sciences inorganic chemistry halogens
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Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
CB2 1EW Cambridge
United Kingdom
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.