title: Terahertz disorder-localized rotational modes and lattice vibrational modes in the orientationally-disordered and ordered phases of camphor.
abstract: 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.
authors.affiliation: Electrical and Computer Engineering Department, Rice University, 6100 Main St., Houston, TX 77005, USA. dn4@rice.edu.
authors.forename: Daniel V
authors.initials: DV
authors.lastname: Nickel
authors.forename: Michael T
authors.initials: MT
authors.lastname: Ruggiero
authors.forename: Timothy M
authors.initials: TM
authors.lastname: Korter
authors.forename: Daniel M
authors.initials: DM
authors.lastname: Mittleman