Interfacial Vibrational Dynamics of Ice Ih and Liquid Water

Insights into energy flow dynamics at ice surfaces are essential for understanding chemical dynamics relevant to atmospheric and geographical sciences. Here, employing ultrafast surface-specific spectroscopy, we report the interfacial vibrational dynamics of ice Ih. A comparison to liquid water surf...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2020-06, Vol.142 (28), p.12005-12009
Main Authors: Sudera, Prerna, Cyran, Jenée D, Deiseroth, Malte, Backus, Ellen H. G, Bonn, Mischa
Format: Article
Language:English
Subjects:
Communication
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Summary:Insights into energy flow dynamics at ice surfaces are essential for understanding chemical dynamics relevant to atmospheric and geographical sciences. Here, employing ultrafast surface-specific spectroscopy, we report the interfacial vibrational dynamics of ice Ih. A comparison to liquid water surfaces reveals accelerated vibrational energy relaxation and dissipation at the ice surface for hydrogen-bonded OH groups. In contrast, free-OH groups sticking into the vapor phase exhibit substantially slower vibrational dynamics on ice. The acceleration and deceleration of vibrational dynamics of these different OH groups at the ice surface are attributed to enhanced intermolecular coupling and reduced rotational mobility, respectively. Our results highlight the unique properties of free-OH groups on ice, putatively linked to the high catalytic activities of ice surfaces.
ISSN:0002-7863
1520-5126
DOI:10.1021/jacs.0c04526