Publications by authors named "Grouiez B"
Ozone spectroscopy in the terahertz range from first high-resolution Synchrotron SOLEIL experiments combined with far-infrared measurements and ab initio intensity calculations.
Spectrochim Acta A Mol Biomol Spectrosc
January 2024
Article Synopsis
- Ozone plays a vital role in atmospheric chemistry, climate change, and human health due to its strong absorption of Earth's outgoing radiation, particularly in the THz range.
- This study presents the first high-resolution analysis of ozone spectra in the THz range using SOLEIL's Synchrotron light source, showcasing the detection of numerous ozone transitions and improvements over previous data.
- New measurements have revealed significant deviations from existing databases, especially for high quantum number energy levels, leading to the creation of updated linelists for better atmospheric modeling and transmittance predictions.
This paper presents a first demonstration of range-resolved differential absorption LIDAR (DIAL) measurements of the water vapor main isotopologue H O and the less abundant semi-heavy water isotopologue HDO with the aim of determining the isotopic ratio. The presented Water Vapor and Isotope Lidar (WaVIL) instrument is based on a parametric laser source emitting nanosecond pulses at 1.98 µm and a direct-detection receiver utilizing a commercial InGaAs PIN photodiode.
View Article and Find Full Text PDFSpace-based active sensing of CO(2) concentration is a very promising technique for the derivation of CO(2) surface fluxes. There is a need for accurate spectroscopic parameters to enable accurate space-based measurements to address global climatic issues. New spectroscopic measurements using laser diode absorption spectroscopy are presented for the preselected R30 CO(2) absorption line ((20(0)1)(III)<--(000) band) and four others.
View Article and Find Full Text PDFPulsed quantum-cascade-laser (QCL) spectrometers are usually used to detect atmospheric gases with either the interpulse technique (short pulses, typically 5-20 ns) or the intrapulse technique (long pulses, typically 500-800 ns). Each of these techniques has many drawbacks, which we present. Particularly the gas absorption spectra are generally distorted.
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