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THE INTERACTION OF STRONG HYDROGEN-BONDING MOLECULES WITH THE SURFACE OF NANO-SIZED CRYSTALLINE ICE CLUSTERS

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/13559

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Title: THE INTERACTION OF STRONG HYDROGEN-BONDING MOLECULES WITH THE SURFACE OF NANO-SIZED CRYSTALLINE ICE CLUSTERS
Creators: Delzeit, Lance; Devlin, J. Paul
Issue Date: 1996
Abstract: The adsorption of strong hydrogen-bonding molecules to the surface of ice nanocrystals causes the surface and/or subsurface modes of the cluster to be shifted to lower frequency. These shifted modes form a triplet with band centers at the characteristic frequencies of the bulk modes. This effect will be explained in terms of the acidic and basic groups of the adsorbate molecules and the spatial relationship of these groups to the surface groups of the clusters. The IR difference spectra of the adsorbate-coated minus the bare clusters will be compared to the bulk amorphous and bulk crystalline deposits. Some of the strong adsorbates that will be considered are $H_{2}S$, HCN, and $SO_{3}$. A comparison between strong and weak hydrogen-bonding adsorbates will be made using differences in the IR spectra. $CF_{4}$ has previously been used in identifying the ""disordered"" nature of the ice surface. Its spectrum is known to have a distinctive structure, in the intensity and shape of the T/L. splitting of the antisymmetric stretch, which is indicative of the vertical roughness and lateral disorder of the surface. It will be used again in identifying the surface ""disorder"" of the adsorbate-coated clusters. This will give further insight into the character of the surface of the adsorbate-coated clusters. A new ice surface-localized mode has been observed. It can tentatively be assigned to one of two possible modes: 1)The symmetric stretch of the dangling-hydrogen water molecule, or 2) the globally symmetric O-H stretch mode activated by surface polarization. Arguments for each will be addressed.
URI: http://hdl.handle.net/1811/13559
Other Identifiers: 1996-RF-10
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