Abstract
The collision broadenings of the Na D lines were calculated from the transmission measurements of the vapor in sub-μTorr and μTorr regions by modeling the line shape with the Voigt profile. From the line shift, the average time between collisions is calculated. The ratio of the width to the shift is of the order of 10 −4 implying that the impact approximation is valid. Expanding the line widths and shifts in powers of the product of number density and mean velocity of the atoms, the radiative transition probabilities, and the fundamental line shape constants: collision cross-sections and asymmetry of the lines are obtained. Moreover, from the line shifts and using the estimated value of the optical collision diameter obtained from the line widths, the average C 3 value, over the temperature ranges the experiment covers, is calculated.
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