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research article

Stark coefficients for highly excited rovibrational states of H2O

Grechko, Maxim  
•
Aseev, Oleg  
•
Rizzo, Thomas R.  
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2012
Journal of Chemical Physics

Quantum beat spectroscopy is combined with triple-resonance vibrational overtone excitation to measure the Stark coefficients (SCs) of the water molecule for 28 rovibrational levels lying from 27 600 to 41 000 cm−1. These data provide a stringent test for assessing the accuracy of the available potential energy surfaces (PESs) and dipole moment surfaces (DMSs) of this benchmark molecule in this energy region, which is inaccessible by direct absorption. SCs, calculated using the combination of a high accuracy, spectroscopically determined PES and a recent ab initio DMS, are within the 1% accuracy of available experimental data for levels below 25 000 cm−1 , and within 4.5% for coefficients associated with levels up to 35000 cm−1. However, the error in the computed coefficients is over 60% for the very high rovibrational states lying just below the lowest dissociation threshold, due, it seems, to lack of a high accuracy PES in this region. The comparative analysis sug-gests further steps, which may bring the theoretical predictions closer to the experimental accuracy.

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Type
research article
DOI
10.1063/1.4730295
Web of Science ID

WOS:000305881100019

Author(s)
Grechko, Maxim  
Aseev, Oleg  
Rizzo, Thomas R.  
Zobov, N. F.
Lodi, L.
Tennyson, J.
Polyansky, O. L.
Boyarkine, Oleg V.  
Date Issued

2012

Publisher

American Institute of Physics

Published in
Journal of Chemical Physics
Volume

136

Article Number

244308

Subjects

vibrational spectroscopy

•

water

•

highly excited molecules

Editorial or Peer reviewed

NON-REVIEWED

Written at

EPFL

EPFL units
LCPM  
Available on Infoscience
June 27, 2012
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/82422
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