Temperature effects on the molecular Raman backscatter cross-sections due to narrow-band interference filters

Haimerl, Michael : Temperature effects on the molecular Raman backscatter cross-sections due to narrow-band interference filters. ILRC 2024, Landshut, 23.-28.06.2024.

Abstract

When electromagnetic radiation interacts with molecules, elastic and inelastic scattering processes occur. In contrast to elastic scattering, the wavelength and the state of polarization of scattered photons may change when they are scattered inelastically. In this abstract we will focus on the inelastic scattering processes, the so-called Raman scattering. In particular, we investigate the effect of atmospheric temperature on the molecular rotational-vibrational (ro-vibrational) Raman backscatter cross-section which may occur after transmission of the backscattered radiation through narrow-band interference filters (IF). To analyze the consequence of the changing temperature we apply the equations published by M. Adam [1] to calculate the temperature dependent ro-vibrational Raman backscatter cross-section for the N2 molecule at 387 nm (laser wavelength of 355 nm). These equations have been implemented and evaluated as part of the Algorithm for Rayleigh and Raman calculations (ARC) that has been developed within ACTRIS [5]. Here, we show how the central wavelength and bandwidth of the IF affects the molecular Raman backscattering cross-section of N2 for different temperature conditions.

• Dokumententyp: Konferenzbeitrag (Poster)
• EU Funded Grant Agreement Number: 871115
• EU-Projekte: Horizon Europe
• Keywords: Raman scattering; Lidar backscatter cross-section; Raman interference filters
• Fakultät: Physik > Meteorologie
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik ; 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie
• Sprache: Englisch

Literaturliste

[1] M. Adam, “Notes on Temperature-Dependent Lidar Equations”, AMetSoc Vol. 26, 1021–1039 (2009). 

[2] U. Waninger, “Raman lidar” (C. Weitcamp, „Lidar, Range-Resolved Optic Remote Sensing of the Atmosphere“, Optical science, 241-271 (2005).

[3] C.-Y. She, “Spectral structure of laser light scattering revisited: bandwidths of non-resonant scattering lidars”, AO Vol. 40, 4875-4884 (2001).

[4] A. Berhendt, T. Nakamura, „Calculation of the calibration constant of polarization lidar and its dependency on atmospheric temperature“, OE Vol. 10, 805-817 (2002).

[5] N. Siomos et al., “Rotational Raman Scattering Through Narrow-Band Interference Filters: Investigating Uncertainties Using a New Rayleigh Scattering Code Developed within ACTRIS”, Sullivan, J.T., et al. ILRC 2022. Spring Atmospheric sciences (2022).