Cation Depth-Distribution at Alkali Halide Aqueous Solution Surfaces

Héloise Tissot; Giorgia Olivieri; Jean Jacques Gallet; Fabrice Bournel; Mathieu G. Silly; Fausto Sirotti; François Rochet

doi:10.1021/jp512695c

Cation Depth-Distribution at Alkali Halide Aqueous Solution Surfaces

Héloise Tissot, Giorgia Olivieri, Jean Jacques Gallet, Fabrice Bournel, Mathieu G. Silly, Fausto Sirotti, François Rochet

Research output: Contribution to journal › Article › peer-review

Abstract

Using synchrotron radiation Near-Ambient Pressure X-ray photoemission spectroscopy (NAP-XPS) in surface and bulk sensitive conditions, we specifically explored the depth distribution of Na⁺ ions near the vapor/liquid interface of saturated solutions of sodium halides (NaCl, NaBr, and NaI) kept at 278 K under a pressure of 8 mbar. By varying the photoelectron kinetic energy, and hence the probing depth, we show that the Na⁺ depth distribution near the surface is highly sensitive to the size and polarizability of the anion. The large polarizable anions, Br^- and I^- that segregate at the surface, tend to drag the Na⁺ ions closer to the liquid-water surface. However, this situation is not observed for the NaCl solution, in line with recent theoretical results.

Original language	English
Pages (from-to)	9253-9259
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	119
Issue number	17
DOIs	https://doi.org/10.1021/jp512695c
Publication status	Published - 30 Apr 2015
Externally published	Yes

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title = "Cation Depth-Distribution at Alkali Halide Aqueous Solution Surfaces",

abstract = "Using synchrotron radiation Near-Ambient Pressure X-ray photoemission spectroscopy (NAP-XPS) in surface and bulk sensitive conditions, we specifically explored the depth distribution of Na+ ions near the vapor/liquid interface of saturated solutions of sodium halides (NaCl, NaBr, and NaI) kept at 278 K under a pressure of 8 mbar. By varying the photoelectron kinetic energy, and hence the probing depth, we show that the Na+ depth distribution near the surface is highly sensitive to the size and polarizability of the anion. The large polarizable anions, Br- and I- that segregate at the surface, tend to drag the Na+ ions closer to the liquid-water surface. However, this situation is not observed for the NaCl solution, in line with recent theoretical results.",

author = "H{\'e}loise Tissot and Giorgia Olivieri and Gallet, \{Jean Jacques\} and Fabrice Bournel and Silly, \{Mathieu G.\} and Fausto Sirotti and Fran{\c c}ois Rochet",

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doi = "10.1021/jp512695c",

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T1 - Cation Depth-Distribution at Alkali Halide Aqueous Solution Surfaces

AU - Tissot, Héloise

AU - Olivieri, Giorgia

AU - Gallet, Jean Jacques

AU - Bournel, Fabrice

AU - Silly, Mathieu G.

AU - Sirotti, Fausto

AU - Rochet, François

PY - 2015/4/30

Y1 - 2015/4/30

N2 - Using synchrotron radiation Near-Ambient Pressure X-ray photoemission spectroscopy (NAP-XPS) in surface and bulk sensitive conditions, we specifically explored the depth distribution of Na+ ions near the vapor/liquid interface of saturated solutions of sodium halides (NaCl, NaBr, and NaI) kept at 278 K under a pressure of 8 mbar. By varying the photoelectron kinetic energy, and hence the probing depth, we show that the Na+ depth distribution near the surface is highly sensitive to the size and polarizability of the anion. The large polarizable anions, Br- and I- that segregate at the surface, tend to drag the Na+ ions closer to the liquid-water surface. However, this situation is not observed for the NaCl solution, in line with recent theoretical results.

AB - Using synchrotron radiation Near-Ambient Pressure X-ray photoemission spectroscopy (NAP-XPS) in surface and bulk sensitive conditions, we specifically explored the depth distribution of Na+ ions near the vapor/liquid interface of saturated solutions of sodium halides (NaCl, NaBr, and NaI) kept at 278 K under a pressure of 8 mbar. By varying the photoelectron kinetic energy, and hence the probing depth, we show that the Na+ depth distribution near the surface is highly sensitive to the size and polarizability of the anion. The large polarizable anions, Br- and I- that segregate at the surface, tend to drag the Na+ ions closer to the liquid-water surface. However, this situation is not observed for the NaCl solution, in line with recent theoretical results.

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DO - 10.1021/jp512695c

M3 - Article

AN - SCOPUS:84928901656

SN - 1932-7447

VL - 119

SP - 9253

EP - 9259

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 17

ER -

Cation Depth-Distribution at Alkali Halide Aqueous Solution Surfaces

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