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A local mode picture for H atom reaction with vibrationally excited H(2)O: a full dimensional state-to-state quantum dynamics investigation

A local mode picture was postulated some time ago to explain the negligible OD product excitation from H reacting with D(2)O in fundamental asymmetrical excitation: the D(2)O asymmetric stretch state is best thought as a linear combination of local mode stretches with the H atom reacting preferentia...

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Autores principales: Liu, Shu, Zhang, Dong H.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Royal Society of Chemistry 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5515045/
https://www.ncbi.nlm.nih.gov/pubmed/28758003
http://dx.doi.org/10.1039/c5sc03472h
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author Liu, Shu
Zhang, Dong H.
author_facet Liu, Shu
Zhang, Dong H.
author_sort Liu, Shu
collection PubMed
description A local mode picture was postulated some time ago to explain the negligible OD product excitation from H reacting with D(2)O in fundamental asymmetrical excitation: the D(2)O asymmetric stretch state is best thought as a linear combination of local mode stretches with the H atom reacting preferentially with the excited OD bond, but has never been verified. Here we report the first full-dimensional state-to-state study for the title reaction with H(2)O in the ground and the first symmetric and asymmetric stretching excited states. It is found that symmetric and asymmetric stretching excited states, which vibrate in very different ways in the normal mode picture, behave essentially identically in the reaction. More importantly, our calculations revealed that the reaction produces a small fraction of OH in the v = 1 state, with the population close to the relative reactivity between the ground and vibrationally excited states, and therefore it confirms the local mode picture for H(2)O in symmetric or asymmetric stretch states when reacting with an H atom.
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spelling pubmed-55150452017-07-28 A local mode picture for H atom reaction with vibrationally excited H(2)O: a full dimensional state-to-state quantum dynamics investigation Liu, Shu Zhang, Dong H. Chem Sci Chemistry A local mode picture was postulated some time ago to explain the negligible OD product excitation from H reacting with D(2)O in fundamental asymmetrical excitation: the D(2)O asymmetric stretch state is best thought as a linear combination of local mode stretches with the H atom reacting preferentially with the excited OD bond, but has never been verified. Here we report the first full-dimensional state-to-state study for the title reaction with H(2)O in the ground and the first symmetric and asymmetric stretching excited states. It is found that symmetric and asymmetric stretching excited states, which vibrate in very different ways in the normal mode picture, behave essentially identically in the reaction. More importantly, our calculations revealed that the reaction produces a small fraction of OH in the v = 1 state, with the population close to the relative reactivity between the ground and vibrationally excited states, and therefore it confirms the local mode picture for H(2)O in symmetric or asymmetric stretch states when reacting with an H atom. Royal Society of Chemistry 2016-01-01 2015-09-29 /pmc/articles/PMC5515045/ /pubmed/28758003 http://dx.doi.org/10.1039/c5sc03472h Text en This journal is © The Royal Society of Chemistry 2015 http://creativecommons.org/licenses/by/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution 3.0 Unported License (http://creativecommons.org/licenses/by/3.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Chemistry
Liu, Shu
Zhang, Dong H.
A local mode picture for H atom reaction with vibrationally excited H(2)O: a full dimensional state-to-state quantum dynamics investigation
title A local mode picture for H atom reaction with vibrationally excited H(2)O: a full dimensional state-to-state quantum dynamics investigation
title_full A local mode picture for H atom reaction with vibrationally excited H(2)O: a full dimensional state-to-state quantum dynamics investigation
title_fullStr A local mode picture for H atom reaction with vibrationally excited H(2)O: a full dimensional state-to-state quantum dynamics investigation
title_full_unstemmed A local mode picture for H atom reaction with vibrationally excited H(2)O: a full dimensional state-to-state quantum dynamics investigation
title_short A local mode picture for H atom reaction with vibrationally excited H(2)O: a full dimensional state-to-state quantum dynamics investigation
title_sort local mode picture for h atom reaction with vibrationally excited h(2)o: a full dimensional state-to-state quantum dynamics investigation
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5515045/
https://www.ncbi.nlm.nih.gov/pubmed/28758003
http://dx.doi.org/10.1039/c5sc03472h
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