Étude spectroscopique du complexe de van der Waals eau-diazote

Details

Supervisors

Lauzin, Clément

Faculty

Ecole polytechnique de Louvain

Degree label

Master [120] : ingénieur civil physicien

Abstract

enSpectral analysis of water complexes in the microwave and infrared region is of main interest to explain the Earth atmosphere's energy budget due to possible solar radiation absorption of these complexes in the Earth atmosphere. The water-nitrogen complex may have a significant role in this budget because of the high concentration of nitrogen (~78%), dioxygen (~21%) and water (< 0.5% to ~5%) in the air. This work presents the infrared spectral analysis of the water-nitrogen complex D2O-N2 in the bend region v3=1 (around 3.59 micrometer) of the water molecule D2O in the complex. The supersonic jet technique is briefly described in this report as the experimental set-up used to obtain the spectra. The theory basis needed to understand and analyse the spectra are also presented. The hypothesis allowing the attribution of fifty-eighth Ka = 0 <- 0 transitions observed on the spectrum are detailed in this thesis. The complex tunneling splittings seemed to depend strongly on the intramolecular excitation v3=1 of the D2O molecule in the complex and weakly on the total angular quantum number J. The splittings associated to D2O or N2 permutation rise respectively by at least 1.6 and two orders of magnitude in the v3=1 bend region of the D2O-N2 complex, indicating a significant decrease of the tunneling potential barrier in this state. The intermolecular dynamic of the complex is highly affected by the intramolecular vibration of the D2O molecule in the complex.