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Vibrational Relaxation Dynamics of the Core and Outer Part of Proton-Hydration Clusters
- Source :
- The Journal of Physical Chemistry. B, PubMed Central, The Journal of Physical Chemistry B
- Publication Year :
- 2019
- Publisher :
- American Chemical Society, 2019.
-
Abstract
- We study the ultrafast relaxation dynamics of hydrated proton clusters in acetonitrile using femtosecond mid-infrared pump-probe spectroscopy. We observe a strong dependence of transient absorption dynamics on the frequency of excitation. When we excite the OH vibrations with frequencies ≤3100 cm-1, we observe an ultrafast energy relaxation that leads to the heating of the local environment of the proton. This response is assigned to the OH vibrations of the water molecules in the core of the hydrated proton cluster. When we excite with frequencies ≥3200 cm-1, we observe a relatively slow vibrational relaxation with a T1 time constant ranging from 0.22 ± 0.04 ps at νex = 3200 cm-1 to 0.37 ± 0.02 ps at νex = 3520 cm-1. We assign this response to water molecules in the outer part of the hydrated proton cluster.
- Subjects :
- Materials science
010304 chemical physics
Proton
010402 general chemistry
01 natural sciences
Molecular physics
Article
3. Good health
0104 chemical sciences
Surfaces, Coatings and Films
0103 physical sciences
Femtosecond
Ultrafast laser spectroscopy
Materials Chemistry
Vibrational energy relaxation
Cluster (physics)
Relaxation (physics)
Physical and Theoretical Chemistry
Physics::Chemical Physics
Spectroscopy
Excitation
Subjects
Details
- Language :
- English
- ISSN :
- 15205207 and 15206106
- Volume :
- 123
- Issue :
- 1520-6106
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry. B
- Accession number :
- edsair.doi.dedup.....9a9a58b36d0541413e1cc73189aef0d6