Abstract
Via the quantum mechanical description of thermal neutron scattering at the hydrogen atom nucleus of the methane molecule, a new effect is discovered showing that a neutron with insufficient energy for creating one intravibrational phonon creates the phonon by simultaneous destruction of another intravibrational phonon of the methane molecule. The effect occurs not only with combined inelastic thermal neutron collisions on the intravibrational phonons of the methane molecule but also with combined inelastic scattering at the rotational and intravibrational phonons. Evidently this effect exists theoretically for all incident thermal neutron energies E0 in (1 meV, 100 meV) investigated.
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