Publications by authors named "Melissa Meder"

This study assesses the atmospheric impact of reactions between unsaturated hydrocarbons such as isoprene and monoterpenes and peroxy radicals containing various functional groups. We find that reactions between alkenes and acyl peroxy radicals have reaction rates high enough to be feasible in the atmosphere and lead to high molar mass accretion products. Moreover, the reaction between unsaturated hydrocarbons and acyl peroxy radicals leads to an alkyl radical, to which molecular oxygen rapidly adds.

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Article Synopsis
  • The study introduces a fast polarity switching method in chemical ionization mass spectrometry, combining a multischeme chemical ionization inlet (MION) with an Orbitrap mass spectrometer to analyze trace species in complex samples effectively.* -
  • By using reagent ions in both positive (diethylammonium) and negative (nitrate) polarities, the system enhances the detection of various compounds, like pesticides and reactive organic species, significantly compared to traditional methods.* -
  • The MION-Orbitrap demonstrated high mass resolving power (280,000) and rapid polarity switching capability, allowing real-time monitoring and detection of a broader range of species, showing its potential as a versatile analytical tool.*
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Dimeric accretion products have been observed both in atmospheric aerosol particles and in the gas phase. With their low volatilities, they are key contributors to the formation of new aerosol particles, acting as seeds for more volatile organic vapors to partition onto. Many particle-phase accretion products have been identified as esters.

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Orbitrap Fourier transform mass spectrometry coupled with chemical ionization (CI) is a new-generation technique for online analysis in atmospheric chemistry. The advantage of the high resolving power of the CI-Orbitrap has been compromised by its relatively low sensitivity to trace compounds (e.g.

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