Single photons in the infrared spectral range are usually insufficiently energetic to cause direct photodissociation of molecules. But, after the absorption of multiple infrared photons, a molecule can gain internal energy to overcome its barrier for dissociation. A high-power laser can be used to perform multiple photon dissociation, such as IRMPD and MPD, using infrared radiation. For instance, a free-electron laser, a carbon dioxide laser, or the long interaction times of the molecule with the radiation field without the ability to cool quickly. For instance, collisions.