Browsing by Author "Benti Tulu"
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Item Optical Measurement of Number Density, Absorption Coefficient, and index of Refraction of Dilute Sodium Vapor(Addis Ababa University, 2001-06) Benti Tulu; Asfaw Araya (PhD)In this thesis, the number density and vapor pressure of a sodium atom in the temperature ranges 337 K, close to room temperature, up to 511 K are determined from the measurement of the transmittance and temperature of the sample. The broadening parameters at different temperatures are determined for the two lines. The absorption coefficients, and index of refraction of the sodium atom in the optical region, at the D lines (589.76 nm and 589.16 nm), are obtained