Relative Raman Cross Section for O3, CH4, C3H8, NO, N2O, and H2

Abstract

The relative Raman cross sections of gases which are of interest in air pollution studies have been measured at 5145 Å. These relative differential cross sections compared to that of N₂ are as follows: O₃ (4.0), CH₄ (8.0), C₃H₈ (2.4, 5.8), NO (0.55), N₂O (2.7, 0.53), and H₂ (2.2). The absolute Raman cross section for N₂ has been revised to be (4.4±1.7) × 10⁻³¹ cm²/sr at 5145 Å, for vertically polarized input and 90° scattered Raman radiation that is not analyzed for its polarization.