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Rotational Dynamics of Confined C₆₀ from Near-Infrared Raman Studies under High Pressure
Yonggang Zou, Bingbing Liu, Liancheng Wang, Dedi Liu, Shidan Yu, Peng Wang, Tianyi Wang, Mingguang Yao, Quanjun Li, Bo Zou, Tian Cui, Guangtian Zou, Thomas Wagberg, Bertil Sundqvist and Ho-Kwang Mao
Proceedings of the National Academy of Sciences of the United States of America
Vol. 106, No. 52 (Dec. 29, 2009), pp. 22135-22138
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/40536411
Page Count: 4
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Peapods present a model system for studying the properties of dimensionally constrained crystal structures, whose dynamical properties are very important. We have recently studied the rotational dynamics of C₆₀ molecules confined inside single walled carbon nanotube (SWNT) by analyzing the intermediate frequency mode lattice vibrations using near-infrared Raman spectroscopy. The rotation of C₆₀ was tuned to a known state by applying high pressure, at which condition C₆₀ first forms dimers at low pressure and then forms a single-chain, nonrotating, polymer structure at high pressure. In the latter state the molecules form chains with a 2-fold symmetry. We propose that the C₆₀ molecules in SWNT exhibit an unusual type of ratcheted rotation due to the interaction between C₆₀ and SWNT in the "hexagon orientation," and the characteristic vibrations of ratcheted rotation becomes more obvious with decreasing temperature.
Proceedings of the National Academy of Sciences of the United States of America © 2009 National Academy of Sciences