Confinement Effects on the Nuclear Spin Isomer Conversion of H sub(2)O

The mechanism for interconversion between the nuclear spin isomers (NSI) of H sub(2)O remains shrouded in uncertainties. The temperature dependence displayed by NSI interconversion rates for H sub(2)O isolated in an argon matrix provides evidence that confinement effects are responsible for the dram...

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Published inThe journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Vol. 121; no. 8; pp. 1571 - 1576
Main Authors Turgeon, Pierre-Alexandre, Vermette, Jonathan, Alexandrowicz, Gil, Peperstraete, Yoann, Philippe, Laurent, Bertin, Mathieu, Fillion, Jean-Hugues, Michaut, Xavier, Ayotte, Patrick
Format Journal Article
LanguageEnglish
Published 02.03.2017
Subjects
Confinement
Conversion
Interstellar matter
Isomers
Nuclear spin
Spectroscopy
Spin temperature
Temperature dependence
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Summary:The mechanism for interconversion between the nuclear spin isomers (NSI) of H sub(2)O remains shrouded in uncertainties. The temperature dependence displayed by NSI interconversion rates for H sub(2)O isolated in an argon matrix provides evidence that confinement effects are responsible for the dramatic increase in their kinetics with respect to the gas phase, providing new pathways for o-H sub(2)O reversible reaction p-H sub(2)O conversion in endohedral compounds. This reveals intramolecular aspects of the interconversion mechanism which may improve methodologies for the separation and storage of NSI en route to applications ranging from magnetic resonance spectroscopy and imaging to interpretations of spin temperatures in the interstellar medium.
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ISSN:1089-5639
1520-5215
DOI:10.1021/acs.jpca.7b00893