Laser interferometric investigations on some physical properties of Natural bio-gases

Abstract

Abstract In this work a Mach-Zehnder interferometer system [MZIS] was constructed and illuminated by using [He-Ne] laser. And a gas flow system [GFS] was strictly designed and constructed that was connected to [MZIS], this gas flow system was controlled by both temperature range between 313 to 348 K and pressure range from 60-90 cm-Hg. The [MZIS] and [GFS] were linked and used for determining the refractive index of Methane [CH4] and Nitrogen [N2] gases as a function of pressure n[p]T, and temperature n[T]P. The variety of refractive index of gases regarding the pressure factor at steady temperature (dn/dp)T was resolved. Likewise, the variety of refractive index of gases regarding to temperature at steady pressure factor [dn/dT]P was determined. By applying both Maxwell’s and Clausius-Mostii equations, some physical parameters of Methane and Nitrogen gases, which related to refractive index, like as optical permittivity, dielectric susceptibility, Specific refractivity, Molar refractivity, and Molecular radius were estimated. In addition, the volume expansion values of the investigated gas samples were evaluated. Theoretically, by using Gaussian 09 program we had got some chemical parameters for Methane and Nitrogen.