Knowledge Bank

The high resolution infrared spectrum of LiF has been measured in emission with the McMath Fourier transform interferometer at Kitt Peak. 800 lines with $\nu =1\to 0$ to $\nu =8\to 7$ of the main isotopomer $\mathrm{<mrow\; data-mjx-texclass="ORD">7</mrow>}$LiF and 250 lines with $\nu =1\to 0$ to $\nu =3\to 2$ of the minor isotopomer $\mathrm{<mrow\; data-mjx-texclass="ORD">6</mrow>}$LiF were observed. These ro-vibrational transitions and pure rotational transitions from the $literature1$ were fit to a set of Dunham coefficients $Yij$ and a set of mass-reduced Dunham coefficients $Uij$. The infrared spectrum of LiF was found ``accidentally"" during an attempt to measure the infrared spectrum of $MgF2$. $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$ F.F. Pearson and W. Gordy, Phys. Rev., 177, 52--58 (1969)