The rotation-vibration structure of the SO2 C1B2 state explained by a new internal coordinate force field
Abstract
A new quartic force field for the SO2 $$\tilde{C}$$1B2 state has been derived, based on high resolution data from S16O2 and S18O2. Included are eight b2 symmetry vibrational levels of S16O2 reported in the first paper of this series [G. B. Park et al., J. Chem. Phys. 144, 144311 (2016)]. Many of the experimental observables not included in the fit, such as the Franck-Condon intensities and the Coriolis-perturbed effective C rotational constants of highly anharmonic $$\tilde{C}$$ state vibrational levels, are well reproduced using our force field. Because the two stretching modes of the $$\tilde{C}$$ state are strongly coupled via Fermi-133 interaction, the vibrational structure of the $$\tilde{C}$$ state is analyzed in a Fermi-system basis set, constructed explicitly in this work via partial diagonalization of the vibrational Hamiltonian. The physical significance of the Fermi-system basis is discussed in terms of semiclassical dynamics, based on study of Fermi-resonance systems by Kellman and Xiao [J. Chem. Phys. 93, 5821 (1990)]. By diagonalizing the vibrational Hamiltonian in the Fermi-system basis, the vibrational characters of all vibrational levels can be determined unambiguously. It is shown that the bending mode cannot be treated separately from the coupled stretching modes, particularly at vibrational energies of more thanmore »
- Authors:
-
- Massachusetts Institute of Technology, Cambridge, MA (United States)
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1248473
- Alternate Identifier(s):
- OSTI ID: 1247608; OSTI ID: 1733332; OSTI ID: 1831802
- Grant/Contract Number:
- FG02-87ER13671; FG0287ER13671
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Journal of Chemical Physics
- Additional Journal Information:
- Journal Volume: 144; Journal Issue: 14; Journal ID: ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS; SO2; sulfur dioxide; force field
Citation Formats
Jiang, Jun, Park, G. Barratt, and Field, Robert W. The rotation-vibration structure of the SO2 C1B2 state explained by a new internal coordinate force field. United States: N. p., 2016.
Web. doi:10.1063/1.4945621.
Jiang, Jun, Park, G. Barratt, & Field, Robert W. The rotation-vibration structure of the SO2 C1B2 state explained by a new internal coordinate force field. United States. https://doi.org/10.1063/1.4945621
Jiang, Jun, Park, G. Barratt, and Field, Robert W. 2016.
"The rotation-vibration structure of the SO2 C1B2 state explained by a new internal coordinate force field". United States. https://doi.org/10.1063/1.4945621. https://www.osti.gov/servlets/purl/1248473.
@article{osti_1248473,
title = {The rotation-vibration structure of the SO2 C1B2 state explained by a new internal coordinate force field},
author = {Jiang, Jun and Park, G. Barratt and Field, Robert W.},
abstractNote = {A new quartic force field for the SO2 $\tilde{C}$1B2 state has been derived, based on high resolution data from S16O2 and S18O2. Included are eight b2 symmetry vibrational levels of S16O2 reported in the first paper of this series [G. B. Park et al., J. Chem. Phys. 144, 144311 (2016)]. Many of the experimental observables not included in the fit, such as the Franck-Condon intensities and the Coriolis-perturbed effective C rotational constants of highly anharmonic $\tilde{C}$ state vibrational levels, are well reproduced using our force field. Because the two stretching modes of the $\tilde{C}$ state are strongly coupled via Fermi-133 interaction, the vibrational structure of the $\tilde{C}$ state is analyzed in a Fermi-system basis set, constructed explicitly in this work via partial diagonalization of the vibrational Hamiltonian. The physical significance of the Fermi-system basis is discussed in terms of semiclassical dynamics, based on study of Fermi-resonance systems by Kellman and Xiao [J. Chem. Phys. 93, 5821 (1990)]. By diagonalizing the vibrational Hamiltonian in the Fermi-system basis, the vibrational characters of all vibrational levels can be determined unambiguously. It is shown that the bending mode cannot be treated separately from the coupled stretching modes, particularly at vibrational energies of more than 2000 cm-1. Based on our force field, the structure of the Coriolis interactions in the $\tilde{C}$ state of SO2 is also discussed. We identify the origin of the alternating patterns in the effective C rotational constants of levels in the vibrational progressions of the symmetry-breaking mode, νβ (which correlates with the antisymmetric stretching mode in our assignment scheme).},
doi = {10.1063/1.4945621},
url = {https://www.osti.gov/biblio/1248473},
journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 14,
volume = 144,
place = {United States},
year = {Thu Apr 14 00:00:00 EDT 2016},
month = {Thu Apr 14 00:00:00 EDT 2016}
}
Web of Science
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