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This paper demonstrates the applicability of the Poisson - Boltzmann potential of mean force approach to the analysis of X - ray reflectivity measurements that probe the nanoscale ion distribution and the consequences of these underlying distributions for thermodynamic studies , such as interfacial tension measurements , that yield quantities related to the integrated ion distribution .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
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