Revealing excess protons in the infrared spectrum of liquid water
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 elus...
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| Veröffentlicht in: | Scientific reports 2020-07, Vol.10 (1), p.11320-11320, Article 11320 |
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| Hauptverfasser: | , , , , , |
| Format: | Artikel |
| Sprache: | eng |
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| Online-Zugang: | Volltext |
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| Zusammenfassung: | 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
∼
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. |
|---|---|
| ISSN: | 2045-2322 2045-2322 |
| DOI: | 10.1038/s41598-020-68116-w |