Phonon Kinetics at the Solid to Liquid Phase Transition

Alex Davie, Farah Vandrevala, Yanting Deng, Deepu George, Eric Sylvester, Timothy Korter, Erik Einarsson, Jason Benedict, Andrea Markelz

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Terahertz time domain spectroscopy is used to measure the melting kinetics of fructose molecular crystals. Combining single crystal anisotropy measurements with density functional calculations we assign the phonon frequencies and interrogate how specific phonons behave with melting. While nearly all the low frequency phonons continuously red shift with heating and melting, the lowest energy phonon polarized along the c-axis blue shifts at the melting temperature, suggesting an initial structural change immediately before melting. We find that the kinetics follow a 3D growth model with large activation energies consistent with previous DSC measurements. The large activation energies indicate multiple H-bonds must break collectively for the transition. The results suggest THz TDS with sub picosecond resolution could be used to measure ultra-fast kinetics.

Original languageEnglish (US)
Title of host publication2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2020
PublisherIEEE Computer Society
Pages54
Number of pages1
ISBN (Electronic)9781728166209
DOIs
StatePublished - Nov 8 2020
Externally publishedYes
Event45th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2020 - Virtual, Buffalo, United States
Duration: Nov 8 2020Nov 13 2020

Publication series

NameInternational Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz
Volume2020-November
ISSN (Print)2162-2027
ISSN (Electronic)2162-2035

Conference

Conference45th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2020
CountryUnited States
CityVirtual, Buffalo
Period11/8/2011/13/20

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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