Once you have calculated the eigenvalues for one or more potential function, the transition energy spectrum is easily calculated. From the ‘Graph’ menu, choose ‘New Spectrum. A window will appear that instructs you to click on the graph window of two graphs to specify for which graphs the spectrum should be calculated.
Clicking on the same graph twice will calculate the transition spectrum for transitions within a single potential function (this can also be accomplished by right clicking on any single graph). Once two graphs have been selected, a new window will appear showing the transition spectrum.