Abstract.
Incoherent neutron scattering experiments were performed on the tetramethylsilane (TMS) monolayers adsorbed on graphite and MgO (100) surfaces to investigate the dynamics in the orientationally disordered 2-D solid phase. Clear evidence of the order–disorder transition (Ttr=107 K for TMS/graphite) with respect to the reorientation of the TMS molecules is obtained. In the high-temperature phase, the molecules are found to undergo fairly excited rotational motion, and it is proposed that some of the molecules also undergo translational diffusion. Such a situation does not change very much at higher temperatures across the melting point of the 2-D solid (Tm=146 K for TMS/graphite). The activation energies as well as the correlation times are obtained for the relevant molecular motions and compared with the bulk case.
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Received: 19 July 2001 / Accepted: 24 October 2001
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Sakisato, N., Inaba, A. & Matsuo, T. Orientational disorder in solid monolayers of tetramethylsilane adsorbed on graphite and MgO (100) surfaces . Appl Phys A 74 (Suppl 1), s1373–s1375 (2002). https://doi.org/10.1007/s003390101239
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DOI: https://doi.org/10.1007/s003390101239