Relative Raman cross section of O3 for four Ar+ laser frequencies

Abstract

We have measured the relative Raman scattering cross sections of O₃ (referred to N₂) and the depolarization ratios at four argon‐ion laser pump frequencies to be, respectively, 2.3 and 0.05 at 20 981 cm⁻¹, 2.5 and 0.03 at 20 487 cm⁻¹, 2.8 and 0.04 at 20 135 cm⁻¹, and 2.2 and 0.10 at 19 430 cm⁻¹. The estimated uncertainty in cross section is ±12% and in depolarization, ±0.01, although the cross sections at different frequencies are thought to intercompare to ±5% or less. An improved sample preparation technique was used. We found no dependence of cross section on pressure and only weak evidence for any resonance dependence on pump frequency.