Knowledge Bank

“The line shape of pressure-broadened spectral lines can be represented by the modified Lorentz expression $\alpha =\alpha o(\Delta \nu )2[|\nu -\nu o|\eta +(\Delta \nu )2]-1$. An investigation of the value of $\eta$ for the R(4) spectral line of the fundamental band of HF has been made to determine the variation of as a function of distance from line center. The range $\eta$ was found to be $\eta =2.00$ for for $|\nu -\nu o|>3cm-1$, and n varies linearly from 2.00 to $1.82\pm .03$ for .”