Structure of the Ethylammonium Nitrate Surface: An X-ray Reflectivity and Vibrational Sum Frequency Spectroscopy Study

vibrational sum frequency air interface spectroscopy Nitrates ethylammonium nitrate (EAN) X-ray reflectivity 02 engineering and technology Reflectivity Symmetry X-ray spectroscopy Vibrational states 0210 nano-technology Molecular structure
DOI: 10.1021/la904697g Publication Date: 2010-03-19T19:37:06Z
ABSTRACT
X-ray reflectivity and vibrational sum frequency spectroscopy are used to probe the structure of the ethylammonium nitrate (EAN)-air interface. X-ray reflectivity reveals that the EAN-air interface is structured and consists of alternating nonpolar and charged layers that extend 31 A into the bulk. Vibrational sum frequency spectroscopy reveals interfacial cations have their ethyl moieties oriented toward air, with the CH(3) C(3) axis positioned approximately 36.5 degrees from interface normal. This structure is invariant between 15 and 51 degrees C. On account of its molecular symmetry, the orientation of the nitrate anion cannot be determined with certainty.
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