This is a fit of molecular spectrometer data gathered from the molecule KF. The molecular spectrometer measures hyperfine transitions in molecules by detecting how many of the molecules go through an energy transition at a particular applied frequency. These hyperfine transitions require much less energy than electron energy level transitions and take place within the radio frequency range. The Stark stick spectrum shows the split in energy levels due to the Stark effect. The fit helps to determine the molecular constants of KF and was done using Mathcad. This data is from the electric resonance molecular beam spectrometer at St. Olaf College in Northfield, MN and was taken in 2001. For a more in-depth explanation, click here.