Raman spectroscopic measurements of <i>ν</i>₁ band of hydrogen sulfide over a wide range of temperature and density in fused‐silica optical cells

Abstract

Abstract A method was developed to determine the fluid density of pure hydrogen sulfide (H 2 S) at a fixed temperature using Raman spectroscopic measurements. The positions of the H 2 S Raman ν 1 band were measured at a wide range of temperatures (188.15 K ≤ T ≤ 633.15 K) and pressures ( P ≤ 506 bar) using fused‐silica capillary capsules and high‐pressure optical cells. The relation among H 2 S density (ρ), H 2 S ν 1 peak position, and T can be represented by ρ = 2447.680 + 0.127 × T − 1.876 × ν 1 − 0.000001 × T 2 − 0.000048 × T × ν 1 + 0.00036 × ν 1 2 (root‐mean‐square error = 0.0197 g/cm 3 and correlation coefficient = 0.9963). This equation can be applied to calculate the density of the H 2 S fluid from the measured H 2 S ν 1 peak position at a given temperature. Finally, the effects of temperature and H 2 S density on ν 1 peak position were examined using isochoric and isothermal experiments.