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Issue 17, 2007
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High resolution rotational spectroscopy on D2O up to 2.7 THz in its ground and first excited vibrational bending states

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Abstract

We present highly accurate laboratory measurements on the pure rotational spectrum of doubly deuterated water, D2O, in selected frequency regions from 10 GHz up to 2.7 THz. Around 140 rotational transitions in both the vibrational ground and first excited bending states (υ2 = 0,1) were measured in total, involving energy levels with unexcelled high J and Ka rotational quantum numbers. The data give valuable information for the spectroscopic analysis of this molecule. In the case of the light and non-rigid water molecule, standard methods for its analysis are limited due to large centrifugal distortion interactions. Here, we present a global analysis of rotational and rovibrational data of the υ2 = 0 and 1 states of D2O by means of an Euler expansion of the Hamiltonian. In addition to the newly measured pure rotational transitions, around 4000 rotational and rovibrational lines have been included from previous work. It was possible to reproduce the extensive dataset to nearly its experimental uncertainty. The improved predictive capability of the model compared to previous work will be demonstrated.

Graphical abstract: High resolution rotational spectroscopy on D2O up to 2.7 THz in its ground and first excited vibrational bending states

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Publication details

The article was received on 25 Sep 2006, accepted on 06 Dec 2006 and first published on 18 Jan 2007


Article type: Paper
DOI: 10.1039/B613925F
Citation: Phys. Chem. Chem. Phys., 2007,9, 2103-2112
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    High resolution rotational spectroscopy on D2O up to 2.7 THz in its ground and first excited vibrational bending states

    S. Brünken, H. S. P. Müller, C. Endres, F. Lewen, T. Giesen, B. Drouin, J. C. Pearson and H. Mäder, Phys. Chem. Chem. Phys., 2007, 9, 2103
    DOI: 10.1039/B613925F

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