Ice Nucleation at the Water–Sapphire Interface:
Transient Sum-Frequency Response without Evidence for Transient Ice
Phase
Version 2 2018-11-08, 18:20
Version 1 2018-10-23, 19:18
Posted on 2018-11-08 - 18:20
Heterogeneous
ice nucleation at the water–sapphire interface
is studied using sum-frequency generation spectroscopy. We follow
the response of the O–H stretch mode of interfacial water during
ice nucleation as a function of time and temperature. The ice and
liquid states each exhibit very distinct, largely temperature-independent
responses. However, at the moment of freezing, a transient response
with a significantly different intensity is observed, with a lifetime
between several seconds and several minutes. The presence of this
transient signal has previously been attributed to a transient phase
of ice. Here, we demonstrate that the transient signal can be explained
without invoking a transient ice phase, as the transient signal can
simply be accounted for by a linear combination of time-dependent
liquid and ice responses.
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Abdelmonem, Ahmed; H. G. Backus, Ellen; Bonn, Mischa (2018). Ice Nucleation at the Water–Sapphire Interface:
Transient Sum-Frequency Response without Evidence for Transient Ice
Phase. ACS Publications. Collection. https://doi.org/10.1021/acs.jpcc.8b07480
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AUTHORS (3)
AA
Ahmed Abdelmonem
EH
Ellen H. G. Backus
MB
Mischa Bonn