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We present a quantum methodology for the calculation of the inelastic neutron scattering (INS) spectra of an H2 molecule confined in a nanoscale cavity. Our approach incorporates the coupled five-dimensional translation-rotation (TR) energy levels and wave functions of the guest molecule. The computed INS spectra are highly realistic and reflect in full the complexity of the coupled TR dynamics on the anisotropic potential energy surfaces of the confining environment. Utilizing this methodology, we simulate the INS spectra of p- and o-H2 in the small cage of the structure II clathrate hydrate and compare them with the experimental data. © 2011 American Physical Society.

physical review. b, condensed matter and materials physics

Quantum calculation of inelastic neutron scattering spectra of a hydrogen molecule inside a nanoscale cavity based on rigorous treatment of the coupled translation-rotation dynamics