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The infrared spectrum of isothiazole in the range 600-1500 cm(-1), including a high-resolution study of the v(11)(A ') band at 818cm(-1) and the v(16)(A '') band at 727cm(-1), together with ab initio studies of the full spectrum

Hegelund, F; Larsen, Randy W. LU ; Aitken, R A; Kraus, H; Nicolaisen, F M and Palmer, M H (2004) In Molecular Physics 102(14-15). p.1583-1595
Abstract
The gas-phase high-resolution infrared spectrum of isothiazole in the range 600-1500 cm(-1) has been recorded, and revised band centres obtained for a number of vibrations. An analysis of the nu(11)(A') band at 818 cm(-1) and the nu(16)(A") band at 727cm(-1) has been performed, using the Watson Hamiltonian, A-reduction, IIIr representation. These were combined with previous microwave spectral data to provide combined analyses for rotational constants and quartic centrifugal distortion constants Delta(J), Delta(JK), Delta(K), delta(J) and delta(K). These extend the knowledge derived from previous microwave and IR spectral studies. The equilibrium structures and the derived harmonic frequencies were calculated by ab initio methods, using a... (More)
The gas-phase high-resolution infrared spectrum of isothiazole in the range 600-1500 cm(-1) has been recorded, and revised band centres obtained for a number of vibrations. An analysis of the nu(11)(A') band at 818 cm(-1) and the nu(16)(A") band at 727cm(-1) has been performed, using the Watson Hamiltonian, A-reduction, IIIr representation. These were combined with previous microwave spectral data to provide combined analyses for rotational constants and quartic centrifugal distortion constants Delta(J), Delta(JK), Delta(K), delta(J) and delta(K). These extend the knowledge derived from previous microwave and IR spectral studies. The equilibrium structures and the derived harmonic frequencies were calculated by ab initio methods, using a variety of basis sets with MP2, MP4 and CCSD(T) methods, and a comparison of these with experimental data is discussed. At a pragmatic level, the closest correlation of the rotational constants with experiment is not obtained with the most sophisticated methodology. Similarly, the vibration frequencies and intensities also vary strongly with the procedure. In particular, we found that the cc-pVTZ + MP2 results probably provide the best numerical comparison with experimental IR data for this molecule. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Molecular Physics
volume
102
issue
14-15
pages
1583 - 1595
publisher
Taylor & Francis
external identifiers
  • wos:000225105500009
  • scopus:9144262695
ISSN
1362-3028
DOI
10.1080/00268970412331287052
language
English
LU publication?
yes
id
0a760367-f490-44f1-b383-18741fbb404c (old id 138914)
date added to LUP
2007-07-03 12:00:00
date last changed
2017-01-01 04:44:07
@article{0a760367-f490-44f1-b383-18741fbb404c,
  abstract     = {The gas-phase high-resolution infrared spectrum of isothiazole in the range 600-1500 cm(-1) has been recorded, and revised band centres obtained for a number of vibrations. An analysis of the nu(11)(A') band at 818 cm(-1) and the nu(16)(A") band at 727cm(-1) has been performed, using the Watson Hamiltonian, A-reduction, IIIr representation. These were combined with previous microwave spectral data to provide combined analyses for rotational constants and quartic centrifugal distortion constants Delta(J), Delta(JK), Delta(K), delta(J) and delta(K). These extend the knowledge derived from previous microwave and IR spectral studies. The equilibrium structures and the derived harmonic frequencies were calculated by ab initio methods, using a variety of basis sets with MP2, MP4 and CCSD(T) methods, and a comparison of these with experimental data is discussed. At a pragmatic level, the closest correlation of the rotational constants with experiment is not obtained with the most sophisticated methodology. Similarly, the vibration frequencies and intensities also vary strongly with the procedure. In particular, we found that the cc-pVTZ + MP2 results probably provide the best numerical comparison with experimental IR data for this molecule.},
  author       = {Hegelund, F and Larsen, Randy W. and Aitken, R A and Kraus, H and Nicolaisen, F M and Palmer, M H},
  issn         = {1362-3028},
  language     = {eng},
  number       = {14-15},
  pages        = {1583--1595},
  publisher    = {Taylor & Francis},
  series       = {Molecular Physics},
  title        = {The infrared spectrum of isothiazole in the range 600-1500 cm(-1), including a high-resolution study of the v(11)(A ') band at 818cm(-1) and the v(16)(A '') band at 727cm(-1), together with ab initio studies of the full spectrum},
  url          = {http://dx.doi.org/10.1080/00268970412331287052},
  volume       = {102},
  year         = {2004},
}