Abstract

Use is made of near-resonance electronic Raman scattering to measure the radial density distribution of Hg(6 ³P₁) in a low-pressure Hg–Ar dc discharge. The intermediate and final states used are 7 ³S₁ and 6 ³P₂, respectively. The detuning Δ from the intermediate state is kept small (3–12 cm⁻¹) in order to boost the Raman cross section enough to get a strong signal from this sparsely populated (~10¹¹ cm⁻³) excited state. Absolute densities are determined by measuring the Raman signal from a known amount of H₂, given the relative Raman cross sections for the two systems. The depolarization ratio ρ = σ_zx/σ_zz is also measured and found to agree with theory. Results for the radial density distribution compare well with those obtained earlier with a different method.

© 1991 Optical Society of America

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