Terahertz Signatures of Hydrate Formation in Alkali Halide Solutions.
Liu, Liyuan; orcid: 0000-0002-7050-3792
Li, Yanfeng; orcid: 0000-0002-7966-8219
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AbstractWe systematically studied the ability of 20 alkali halides to form solid hydrates in the frozen state from their aqueous solutions by terahertz time-domain spectroscopy combined with density functional theory (DFT) calculations. We experimentally observed the rise of new terahertz absorption peaks in the spectral range of 0.3-3.5 THz in frozen alkali halide solutions. The DFT calculations prove that the rise of observed new peaks in solutions containing Li , Na , or F ions indicates the formation of salt hydrates, while that in other alkali halide solutions is caused by the splitting phonon modes of the imperfectly crystallized salts in ice. As a simple empirical rule, the correlation between the terahertz signatures and the ability of 20 alkali halides to form a hydrate has been established.
CitationThe journal of physical chemistry letters, page 7146-7152
DescriptionFrom PubMed via Jisc Publications Router
Publication status: aheadofprint