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Vibrational Relaxation Dynamics of the Core and Outer Part of Proton-Hydration Clusters
[Image: see text] 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 frequ...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2019
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6661761/ https://www.ncbi.nlm.nih.gov/pubmed/31265298 http://dx.doi.org/10.1021/acs.jpcb.9b02067 |
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author | Sofronov, Oleksandr O. Bakker, Huib J. |
author_facet | Sofronov, Oleksandr O. Bakker, Huib J. |
author_sort | Sofronov, Oleksandr O. |
collection | PubMed |
description | [Image: see text] 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 T(1) time constant ranging from 0.22 ± 0.04 ps at ν(ex) = 3200 cm(–1) to 0.37 ± 0.02 ps at ν(ex) = 3520 cm(–1). We assign this response to water molecules in the outer part of the hydrated proton cluster. |
format | Online Article Text |
id | pubmed-6661761 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-66617612019-07-30 Vibrational Relaxation Dynamics of the Core and Outer Part of Proton-Hydration Clusters Sofronov, Oleksandr O. Bakker, Huib J. J Phys Chem B [Image: see text] 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 T(1) time constant ranging from 0.22 ± 0.04 ps at ν(ex) = 3200 cm(–1) to 0.37 ± 0.02 ps at ν(ex) = 3520 cm(–1). We assign this response to water molecules in the outer part of the hydrated proton cluster. American Chemical Society 2019-07-02 2019-07-25 /pmc/articles/PMC6661761/ /pubmed/31265298 http://dx.doi.org/10.1021/acs.jpcb.9b02067 Text en Copyright © 2019 American Chemical Society This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License (http://pubs.acs.org/page/policy/authorchoice_ccbyncnd_termsofuse.html) , which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes. |
spellingShingle | Sofronov, Oleksandr O. Bakker, Huib J. Vibrational Relaxation Dynamics of the Core and Outer Part of Proton-Hydration Clusters |
title | Vibrational Relaxation Dynamics of the Core and Outer
Part of Proton-Hydration Clusters |
title_full | Vibrational Relaxation Dynamics of the Core and Outer
Part of Proton-Hydration Clusters |
title_fullStr | Vibrational Relaxation Dynamics of the Core and Outer
Part of Proton-Hydration Clusters |
title_full_unstemmed | Vibrational Relaxation Dynamics of the Core and Outer
Part of Proton-Hydration Clusters |
title_short | Vibrational Relaxation Dynamics of the Core and Outer
Part of Proton-Hydration Clusters |
title_sort | vibrational relaxation dynamics of the core and outer
part of proton-hydration clusters |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6661761/ https://www.ncbi.nlm.nih.gov/pubmed/31265298 http://dx.doi.org/10.1021/acs.jpcb.9b02067 |
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