Vol. 39, issue 08, article # 1

Abstract:

The development of precise light scattering models for lidar sensing of the Earth's atmosphere requires reliable data on the polarization characteristics of molecules. However, for several key atmospheric constituents, such information is either incomplete or entirely absent. In this work, spontaneous Raman spectroscopy is used to experimentally determine the depolarization ratios of the Q-branches of vibrational bands for N₂, O₂, H₂O, CO₂, and CH₄, which are the main components of atmospheric air. The measurements were performed using a high-sensitivity Raman spectrometer with laser excitation at 532 nm. For the first time, the depolarization ratios were estimated for the CO₂ Fermi-triad bands, as well as 2ν₂ and 2ν₄ overtones of CH₄. Based on the obtained data, the ratios of the derivatives of the polarizability tensor invariants for these molecules were determined. The results complement the existing knowledge on the polarization characteristics of atmospheric gas molecules, which is essential for modeling light scattering processes in the Earth's atmosphere.

Keywords:

Raman scattering, polarization, depolarization ratio, polarizability invariants, atmospheric air, nitrogen, oxygen, water vapor, carbon dioxide, methane

Figures:

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