Infrared spectroscopy of neutral water clusters at finite temperature: Evidence for a noncyclic pentamer.
basic_science · Level V
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- Record sourced from PubMed, PMID 32541029.
- Also identified by DOI 10.1073/pnas.2000601117 and PMC identifier 7355007.
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Abstract
Infrared spectroscopic study of neutral water clusters is crucial to understanding of the hydrogen-bonding networks in liquid water and ice. Here we report infrared spectra of size-selected neutral water clusters, (H<sub>2</sub>O) <sub><i>n</i></sub> (<i>n</i> = 3-6), in the OH stretching vibration region, based on threshold photoionization using a tunable vacuum ultraviolet free-electron laser. Distinct OH stretch vibrational fundamentals observed in the 3,500-3,600-cm<sup>-1</sup> region of (H<sub>2</sub>O)<sub>5</sub> provide unique spectral signatures for the formation of a noncyclic pentamer, which coexists with the global-minimum cyclic structure previously identified in the gas phase. The main features of infrared spectra of the pentamer and hexamer, (H<sub>2</sub>O) <sub><i>n</i></sub> (<i>n</i> = 5 and 6), span the entire OH stretching band of liquid water, suggesting that they start to exhibit the richness and diversity of hydrogen-bonding networks in bulk water.