A New Usage of Laser Interferometer for Accurate Determination of Some Physical Parameters of Carbon Dioxide as One of Most Popular Environmental Pollutant Gas (2)

Abstract

In this article the obtained results of refractive index, by laser interferometer method, of Carbon Dioxide, CO2, molecule were used to determine the physical parameters of this pollutant gas. Because the existence of this gas in the atmosphere under the effect of the atmospheric changes like as pressure, temperature and sun light. These atmospheric changes change the behavior of this pollutant gas according to the change of its physical parameters which tends to more destructive effects on the biological cells. Optical permittivity e, dielectric susceptibility ke, specific refractivity Asp, and molar refractivity Π were determined. The effect of temperature T[K], within the available technical range 308K-358K, on these physical parameters was studied which was known as thermal behavior. The rate of change of these parameters with respect to temperature at constant gas pressure p and incident laser wavelength λ such as (de/dT)p,λ; (dke/dT)p,λ; (dAsp/dT)p,λ; and (dΠ/dT)p,λ were studied showing negative slope values which mean an inverse dependence of e, ke, Asp, and Π respectively. Also, the rate of change of those parameters with respect pressure range 80×103-120×103Pa at constant temperature and laser wavelength, (de/dp)T,λ; (dke/dp)T,λ; (dAsp/dp)T,λ; and (dΠ/dp)T,λ were investigated showing direct proportionality between these parameters and pressure. In addition, the dispersion of these physical parameters, rate of their change with respect to λ, four different selected wavelength, at constant T and p of CO2-gas to be (de/dλ)T,p; (dke/dλ)T,p; (dAsp/dλ)T,p; and (dΠ/dλ)T,p were studied representing inverse dependence of these parameters on λ. The behavior investigations of these physical parameters consider as an index for environmental air pollution investigations.