Observation of High-Resolution Differential Cross Section of Polarized, Rotationally State-Selected LiF on Ar

We report high-resolution differential cross sections at thermal energy for polarized, rotationally state-selected LiF on Ar. They were 2-8% larger with LiF in the $J=\left|M\right|=1\mathrm{}$ orientation along the relative velocity than in the $J=1\mathrm{}$ unpolarized state. The differential cross section in the present case is much more sensitive to change in polarization than is the total cross section. The high-frequency oscillations of the differential cross sections were found substantially independent of $J$ when the present $J=1\mathrm{}$ data were compared with non-state-selected data for $\overline{J}=15\mathrm{}$ or $\overline{J}=25\mathrm{}$.