The dynamic isotope effects (IE) on the translational and rotational motion in liquid ammonia and water are reassessed by NMR measurements. For the translational and rotational IE are clearly distinct. At 298 K, 23% and 30% are obtained, respectively. Both effects as well as the slopes of the temperature dependencies increase with decreasing temperature. For a rotational IE of 37% was observed at 298 K. A small increase to 40% at 222 K could be ascertained. The translational IE is about 15% at room temperature and exhibits a stronger temperature dependence. It is suggested that the observed deviations of the IE’s from the square root of mass and square root of moments of inertia laws are caused by translation-rotation coupling as well as quantum effects. The experimental data obtained in the present paper are also of importance for the correct interpretation of all kinds of experiments on water and ammonia, where isotopic substitutions are involved.
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15 February 2001
Research Article|
February 15 2001
Isotope effect on the translational and rotational motion in liquid water and ammonia
Edme H. Hardy;
Edme H. Hardy
Institut für Physikalische Chemie, RWTH Aachen, D-52056 Aachen, Germany
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Astrid Zygar;
Astrid Zygar
Institut für Physikalische Chemie, RWTH Aachen, D-52056 Aachen, Germany
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Manfred D. Zeidler;
Manfred D. Zeidler
Institut für Physikalische Chemie, RWTH Aachen, D-52056 Aachen, Germany
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Manfred Holz;
Manfred Holz
Institut für Physikalische Chemie, Universität Karlsruhe, D-76128 Karlsruhe, Germany
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Frank D. Sacher
Frank D. Sacher
Institut für Physikalische Chemie, Universität Karlsruhe, D-76128 Karlsruhe, Germany
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J. Chem. Phys. 114, 3174–3181 (2001)
Article history
Received:
October 11 2000
Accepted:
November 21 2000
Citation
Edme H. Hardy, Astrid Zygar, Manfred D. Zeidler, Manfred Holz, Frank D. Sacher; Isotope effect on the translational and rotational motion in liquid water and ammonia. J. Chem. Phys. 15 February 2001; 114 (7): 3174–3181. https://doi.org/10.1063/1.1340584
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