Tuesday, December 2, 2014

Abstract-Terahertz disorder-localized rotational modes and lattice vibrational modes in the orientationally-disordered and ordered phases of camphor

Daniel V. Nickel,*a   Michael T. Ruggiero,b   Timothy M. Korterb and  Daniel M. Mittlemana  

Corresponding authors
Electrical and Computer Engineering Department, Rice University, 6100 Main St., Houston, USA
E-mail: dn4@rice.edu

Department of Chemistry, Syracuse University, 1-014 Center for Science and Technology, Syracuse, USA

The temperature-dependent terahertz spectra of the partially-disordered and ordered phases of camphor (C10H16O) are measured using terahertz time-domain spectroscopy. In its partially-disordered phases, a low-intensity, extremely broad resonance is found and is characterized using both a phenomenological approach and an approach based on ab initio solid-state DFT simulations. These two descriptions are consistent and stem from the same molecular origin for the broad resonance: the disorder-localized rotational correlations of the camphor molecules. In its completely ordered phase(s), multiple lattice phonon modes are measured and are found to be consistent with those predicted using solid-state DFT simulations.

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