Rotational Tunneling in CH4 II: disorder and T-state splitting
Transitions within the tunneling multiplet of CH4 in phase II are an almost classical example of rotational tunneling. Improved high resolution neutron scattering (with larger dynamical ranges and better statistics) does provide much improved data. An experiment at the backscattering instrument BASIS of the SNS on CH2D2 thus has allowed a new way of analysis of linewidths and lineshapes. However, the T-state splitting close to the elastic line as predicted by model calculations could not be resolved on BASIS due to its energy resolution of 3ueV. We propose to use the higher energy resolution of IN16B (0.75 ueV) to measure the T-state splitting on the simpler pure CH4 and furthermore to extend the previous published data on CH2D2 from BASIS. These measurements present a critical test for the new model predictions and the simulation approach based on the pocket state formalism.
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APPEL Markus; Bernhard Frick; KRASNOV Igor and PRESS Werner. (2018). Rotational Tunneling in CH4 II: disorder and T-state splitting. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-04-157
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