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Low-frequency Raman scattering in a Xe hydrate.
S V Adichtchev1, V R Belosludov, A V Ildyakov
1Institute of Automation and Electrometry, Siberian Branch of Russian Academy of Sciences , Novosibirsk, 630090, Russia.
The Journal of Physical Chemistry. B
|August 16, 2013
Summary
This study reveals unique low-frequency Raman scattering in xenon (Xe) hydrates, identifying resonance modes. It also observed distinct decomposition pathways, including a transient band during ice formation.
Area of Science:
- Physics
- Materials Science
- Chemistry
Background:
- Gas hydrates exhibit complex physics, including thermal conductivity anomalies and self-preservation during decomposition.
- These phenomena are potentially linked to guest molecule rattling and lattice mode interactions, influencing low-frequency vibrational responses.
Purpose of the Study:
- To investigate the low-frequency (THz) vibrational response of xenon (Xe) hydrate using Raman scattering.
- To analyze the vibrational density of states through numerical calculations.
- To study the low-frequency Raman scattering during different Xe hydrate decomposition scenarios.
Main Methods:
- Low-frequency Raman scattering spectroscopy was employed to analyze Xe hydrate.
- Numerical calculations of vibrational density of states were performed to support experimental findings.
- Raman scattering was monitored during gas hydrate decomposition under varying conditions.
Main Results:
- Distinct narrow lines in the Raman spectrum (18–90 cm⁻¹) were identified, corresponding to Xe hydrate resonance modes.
- Two decomposition pathways for Xe hydrate were observed: direct decomposition and decomposition via intermediate ice formation.
- A transient low-frequency Raman band, linked to disordered solids (boson peak), was detected during the ice-mediated decomposition.
Conclusions:
- The study confirms the presence of resonance modes in Xe hydrate, contributing to its unique physical properties.
- The observed decomposition pathways provide insights into the stability and phase transitions of gas hydrates.
- The transient band observed during ice formation suggests a connection between hydrate decomposition and the properties of disordered solids.
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