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High-accuracy water potential energy surface for the calculation of infrared spectra.
- Source :
-
Philosophical Transactions of the Royal Society A: Mathematical, Physical & Engineering Sciences . 3/13/2018, Vol. 376 Issue 2115, p1-11. 11p. - Publication Year :
- 2018
-
Abstract
- Transition intensities for small molecules such as water and CO2 can now be computed with such high accuracy that they are being used to systematically replace measurements in standard databases. These calculations use high-accuracy ab initio dipole moment surfaces and wave functions from spectroscopically determined potential energy surfaces (PESs). Here, an extra high-accuracy PES of the water molecule (H216O) is produced starting from an ab initio PES which is then refined to empirical rovibrational energy levels. Variational nuclear motion calculations using this PES reproduce the fitted energy levels with a standard deviation of 0.011 cm-1, approximately three times their stated uncertainty. The use of wave functions computed with this refined PES is found to improve the predicted transition intensities for selected (problematic) transitions. A new room temperature line list for H2 16 is presented. It is suggested that the associated set of line intensities is the most accurate available to date for this species. [ABSTRACT FROM AUTHOR]
- Subjects :
- *POTENTIAL energy surfaces
*INFRARED spectra
*WATER analysis
Subjects
Details
- Language :
- English
- ISSN :
- 1364503X
- Volume :
- 376
- Issue :
- 2115
- Database :
- Academic Search Index
- Journal :
- Philosophical Transactions of the Royal Society A: Mathematical, Physical & Engineering Sciences
- Publication Type :
- Academic Journal
- Accession number :
- 128130103
- Full Text :
- https://doi.org/10.1098/rsta.2017.0149