Rotational excitations in CH4/krypton mixtures

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Abstract
In contrast to the CH4/argon system, methane and krypton form homogeneous solutions. Inelastic neutron scattering (INS) has been used to observe the concentration dependence of the rotational spectra of CH4 in krypton. The methane concentrations (0.3%, 3.2%, and 6.5%) were chosen such that the INS spectra are dominated by scattering from isolated defects and methane dimers. A model based on a Gaussian distribution of local orientational potentials reproduces the measured intensities well and enables the separation of the contributions of the different configurations to the scattering. It is demonstrated that the substitution of one krypton atom on the nearest‐neighbor shell by a methane molecule reduces the energy of the J=1 level by about 5%.

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