Title :

Investigation of the microsolvation of secondary organic aerosol precusors: microwave spectroscopy of nitromethoxyphenols hydrates

Author(s) :

Bracquart, Colwyn [Auteur]
Physique Moléculaire aux Interfaces [PMI]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Deguine, A. [Auteur]
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Chrayteh, Mhamad [Auteur]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Cuisset, A. [Auteur]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Claus, Jordan [Auteur]
Physique Moléculaire aux Interfaces [PMI]
Goubet, Manuel [Auteur]
Physique Moléculaire aux Interfaces [PMI]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]

Conference title :

27th International Conference on High Resolution Molecular Spectroscopy

City :

Bologna

Country :

Italie

Start date of the conference :

2024-09-02

HAL domain(s) :

Physique [physics]/Physique [physics]/Chimie-Physique [physics.chem-ph]

English abstract : [en]

Atmospheric aerosol particles significantly impact Earth’s climate, with Secondary Organic Aerosols (SOAs) crucially influencing the radiative budget andcloud formation due to their hygroscopic properties and effects on ...
Show more >Atmospheric aerosol particles significantly impact Earth’s climate, with Secondary Organic Aerosols (SOAs) crucially influencing the radiative budget andcloud formation due to their hygroscopic properties and effects on atmospheric chemistry. Methoxyphenols (lignin´s monomer) represent a significant part of biomass burning emissions. Recent studies demonstrate that secondary organic aerosols (SOAs) are produced through the oxidation of methoxyphenols like guaiacol and syringol. The primary oxidation products, nitro-guaiacols (NG) and nitro-syringol (NS), lead to the formation of SOAs, which respectively exhibit hydrophobic and hydrophilic properties . We present here the rotational spectroscopy of 4-NG and 4-NS studied using a free jet Fabry-Perot Fourier-transform microwave (FP-FTMW) spectrometer (2 to 20 GHz) with the support of quantum chemistry calculations. Our observations on NG isomers allowed us to identify their lowest energy conformer and simulate its Watsonian rotational parameters. Each isomer shows only one planar conformer stabilized by an intramolecular hydrogen bond as already observed for guaiacol [3]. The microsolvation of 4-NG with water has been investigated, unveiling only one monohydrate complex in agreement with the demonstrated hydrophobic character of 4-NG aerosols. The study of the hydration of 4-NS, a precursor with more hydrophilic SOAs than NG is ongoing.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL