Abstract
The scattering function for methane gas at 295K and 3.0 kbar has been measured for wavevector transfers (Q) from 0.8 to 2.0 AA-1. The maximum energy transfers vary over the range of Q from 13 to 26 meV. The second energy moments of the scattering function were evaluated for 1.6 AA-1<or=Q<or=2.0 AA-1 showing a somewhat lower value, on average, than predictions based on decoupled translational and rotational motions. Combining this observation with the discrepancies between the measured scattering function and the calculated one, again assuming decoupled motions, there is an indication of weak coupling effects in the system. The frequency spectrum, reflecting the dynamics of the methane molecule, is estimated for energy transfers up to 17 meV, showing clear discrepancies compared with simple physical models which do not include coupling effects, e.g. the Langevin or rigid-sphere motion.
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