Radical species in the Atmosphere: Detection and Investigation using Comb-based Absorption Laser Spectroscopy – RADICALS
Reactive radical traces play a fundamental role in atmospheric chemistry and the determination of radical concentrations is today an important challenge. We will address the ambitious goal of detecting these species directly in the atmosphere by developing absorption spectrometers with high sensitivity over a large spectral range. We will use frequency comb lasers to perform long-path detection without losing the coherence of the light, enabling precision spectroscopy and unambiguous quantification of multiple species simultaneously. The specific target will be the gas-phase traces of key radicals such as IO, BrO, NOx, CH3, NO3, HO2, HONO, and formaldehyde. We will develop and test comb-based complimentary long-path techniques: i) single laser dual-comb spectroscopy (DCS), and ii) Fourier transform spectroscopy (FTS); in complementary spectral range: i) in the visible, near-ultraviolet (UV) range and ii) in the mid-infrared (IR). These techniques will be employed to demonstrate simultaneous multi-species atmospheric monitoring.
Project coordination
Daniele ROMANINI (Laboratoire Interdisciplinaire de Physique)
The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.
Partner
LIPHY Laboratoire Interdisciplinaire de Physique
IPR INSTITUT DE PHYSIQUE DE RENNES
IGE Institut des Géosciences de l'Environnement
Help of the ANR 449,012 euros
Beginning and duration of the scientific project:
December 2023
- 48 Months