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Scientific news 2016

Carbon oxides belong to the important anthropogenic and natural climate relevant compounds. WG 3.42 continued the work with carbon monoxide and dioxide, in cooperation with guest researchers from UC London. Meanwhile, a very weak carbon monoxide band has been recorded in the third overtone of the CO molecule, and further spectra have been measured in pure material, as well as in interactions...

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The EUMETRISPEC initiative of WG 3.42, which aims at highly accurate determinations of molecular spectral reference data for important atmospheric gases, concentrated this year on the extension of the existing nitrous oxide (N2O) results.

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The cooperation of PTB and AVL-List GmbH – one of the world’s largest manufacturers of measurement instruments for the automotive sector – continued this year with further experiments at the diesel soot generator at PTB. Stability and reproducibility of the diesel soot generator were further improved. New operating points were determined, which are suitable to model the motoric soot emissions at...

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Airborne molecular contamination (AMC) in the form of chemical vapors or aerosols have a detrimental effect on products, processes or instruments. WG 3.42 will develop a spectroscopic method within this project, which is based on the combination of direct tunable diode laser absorption spectroscopy (dTDLAS) and wavelength modulation spectroscopy (WMS), and which will aim the measurement of HCl...

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The EMPIR-16ENV02 project Black Carbon was launched in summer 2017. During the first phase of the project we have investigated different soot generators regarding their suitability as aerosol sources for absorption photometers. We defined criteria, which aim a certain size range, as well as a defined single-scattering behavior of the soot particles. The first preliminary measurements have been...

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Spectral pressure broadening coefficients of HCl by methane have been determined by WG 3.42, Those added to the application of spectroscopy sensors in quality control of biomethane as an energy source. The work based on direct tunable diode laser absorption spectroscopy (dTDLAS) still aims the qualification of the dTDLAS spectrometer operated with an interband cascade laser (ICL) as an absolute...

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Emission limit values (ELV) for important air pollutants are becoming stricter in European guidelines, which demands for monitoring. Background of the work in WG 3.42 is the application of direct tunable diode laser absorption spectroscopy (dTDLAS) for emission monitoring in cross-stack analyzers. A measurement facility was set up for this purpose, which enables the measurement of HCl...

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Within the frame of the MetNO2 project, WG 3.42 developed FTIR based measurement methods for spectral reference data of NO2, as well as for the detection of impurities in NO2 gas mixtures. The measurements in NO2 are being performed in a corrosion resistant optical short path cell. A newly designed, corrosion resistant long path cell, which is currently in the production phase, shall considerably...

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