THE EFFECT OF TEMPERATURE ON THE HALF-WIDTH OF THE ETHYLENE ABSORPTION AT $10 \mu$

Abstract

Author Institution: Department of Physics, East China Normal UniversityThe line strength and Doppler width will vary only with temperature, whereas the half width will vary both with temperature and pressure. A stabilized $10 \mu p(14) CO_{2}$ laser line was used to measure the variation of absorption with temperature at constant density of ethylene. Measurements of almost complete extinction by the ethylene indicate that the $949.454 cm^{-1}$ and $949.501 cm^{-1}$ transitions are the frequencies which used to be considered. The results of five seperate constant density runs were obtained. The curves were computer-calculated for value of the temperature dependent parameter differing by 0.1 and ranging from 0.5 to 1.2. It is concluded that the temperature dependence of the linewidth is close to $T^{-0.6}$, while the value would be $T^{-0.5}$ according to the theoritical interpretation