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The selected ion flow tube, SIFT, technique is a fast flow tube / ion swarm method to react positive or negative ions with atoms and molecules under truly thermalised conditions over a wide range of temperature. It has been extensively used to study ionmolecule kinetics. — “Selected ion flow tube mass spectrometry - Wikipedia, the”, en.wikipedia.org
This article is within the scope of WikiProject Physics, a In an atom bomb the process of moderation would take too long for it to occur, by the time that a neutron has been thermalised then the other neutrons generated as the same time as the hypothetical thermalised neutron (which has wandered off. — “Talk:Neutron radiation - Wikipedia, the free encyclopedia”, en.wikipedia.org
Even in Generation II PWRs, the neutron spectrum is not fully thermalised. The RMWR concept is dependent on nuclear fuel reprocessing in order to achieve its objectives. — “Reduced moderation water reactor - Wikipedia, the free”, en.wikipedia.org