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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/1910.07578 |
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| _version_ | 1866915889853497344 |
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| author | Artemov, V. G. Uykur, E. Roh, S. Pronin, A. V. Ouerdane, H. Dressel, M. |
| author_facet | Artemov, V. G. Uykur, E. Roh, S. Pronin, A. V. Ouerdane, H. Dressel, M. |
| contents | The most common species in liquid water, next to neutral H$_2$O molecules, are the H$_3$O$^+$ and OH$^-$ ions. In a dynamic picture, their exact concentrations depend on the time scale at which these are probed. Here, using a spectral-weight analysis, we experimentally resolve the fingerprints of the elusive fluctuations-born short-living H$_3$O$^+$, DH$_2$O$^+$, HD$_2$O$^+$, and D$_3$O$^+$ ions in the IR spectra of light (H$_2$O), heavy (D$_2$O), and semi-heavy (HDO) water. We find that short-living ions, with concentrations reaching $\sim 2\%$ of the content of water molecules, coexist with long-living pH-active ions on the picosecond timescale, thus making liquid water an effective ionic liquid in femtochemistry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1910_07578 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | Revealing excess protons in the infrared spectrum of liquid water Artemov, V. G. Uykur, E. Roh, S. Pronin, A. V. Ouerdane, H. Dressel, M. Materials Science Chemical Physics The most common species in liquid water, next to neutral H$_2$O molecules, are the H$_3$O$^+$ and OH$^-$ ions. In a dynamic picture, their exact concentrations depend on the time scale at which these are probed. Here, using a spectral-weight analysis, we experimentally resolve the fingerprints of the elusive fluctuations-born short-living H$_3$O$^+$, DH$_2$O$^+$, HD$_2$O$^+$, and D$_3$O$^+$ ions in the IR spectra of light (H$_2$O), heavy (D$_2$O), and semi-heavy (HDO) water. We find that short-living ions, with concentrations reaching $\sim 2\%$ of the content of water molecules, coexist with long-living pH-active ions on the picosecond timescale, thus making liquid water an effective ionic liquid in femtochemistry. |
| title | Revealing excess protons in the infrared spectrum of liquid water |
| topic | Materials Science Chemical Physics |
| url | https://arxiv.org/abs/1910.07578 |