For this technique, the newly created NaK molecules were exposed to a pair of lasers, the large frequency difference of which exactly matched the energy difference between the molecule's initial, highly vibrating state, and its lowest
possible vibrational state.
In principle, odorant isotopomers provide a
possible test of shape vs. vibration mechanisms: replacing, for example, hydrogen with deuterium in an odorant leaves the ground -
state conformation of the molecule unaltered while doubling atomic mass and so altering the frequency of all its
vibrational modes to a greater or lesser extent [11].