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Vibrational dynamics of ice in reverse micelles
Adriaan M Dokter1, Christian Petersen, Sander Woutersen
1FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands. a.dokter@amolf.nl
The Journal of Chemical Physics
|February 6, 2008
Summary
Ultrafast vibrational dynamics of HDO:D2O ice within reverse micelles were investigated. This micellar amorphous ice exhibits distinct, longer vibrational lifetimes compared to bulk hexagonal ice.
Area of Science:
- Physical Chemistry
- Spectroscopy
- Materials Science
Background:
- Reverse micelles offer confined environments for studying water and ice.
- Understanding ice structure and dynamics is crucial for various scientific fields.
- Amorphous ice phases can exhibit unique properties compared to crystalline forms.
Purpose of the Study:
- To investigate the ultrafast vibrational dynamics of HDO:D2O ice confined in anionic reverse micelles at 180 K.
- To compare the vibrational behavior of micellar amorphous ice with bulk hexagonal ice and micellar liquid water.
- To characterize the micellar structure through heating dynamics.
Main Methods:
- Mid-infrared femtosecond pump-probe spectroscopy was employed.
- A fast-freezing procedure was used to prepare samples at low temperatures.
- Heating dynamics were monitored to analyze micellar structure.
Main Results:
- Small reverse micelles (up to ~150 water molecules) contained an amorphous ice phase.
- This micellar amorphous ice displayed significantly longer vibrational lifetimes than bulk hexagonal ice and micellar liquid water.
- Vibrational lifetime increased linearly with resonance frequency (0.7–4 ps from 3100–3500 cm(-1)).
- The homogeneous linewidth of the amorphous ice was determined to be 55±5 cm(-1).
Conclusions:
- Anionic reverse micelles host an amorphous ice phase with distinct vibrational dynamics.
- The confined amorphous ice exhibits enhanced vibrational lifetimes, suggesting altered intermolecular interactions.
- These findings provide insights into the structure and dynamics of confined water ice.
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