## Abstract

Highly accurate, ~(1-2)×10^{-4}cm^{-1}, ro-vibrational spectrum of S^{18}O_{2} was recorded with Bruker IFS 120 HR Fourier transform interferometer in the region of 1050-1400cm^{-1} where the bands ν_{1} and ν_{3} are located. About 1560 and 1840 transitions were assigned in the experimental spectrum with the maximum values of quantum numbers Jmax./Kamax. equal to 65/22 and 58/16 to the bands ν_{3} and ν_{1}, respectively. The further weighted fit of experimentally assigned transitions was made with the Hamiltonian model which takes into account Coriolis resonance interaction between the vibrational states (100) and (001). To make the ro-vibrational analysis physically more suitable, the initial values of main spectroscopic parameters have been estimated from the values of corresponding parameters of the S^{16}O_{2} species on the basis of the results of the Isotopic Substitution theory. Finally, the set of 23 spectroscopic parameters obtained from the fit reproduces values of 1292 initial "experimental" ro-vibrational energy levels (about 3400 transitions assigned in the experimental spectrum) with the d_{rms}=0.00015cm^{-1}. Also, the ground state parameters of the S^{18}O_{2} molecule were improved.

Original language | English |
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Pages (from-to) | 13-22 |

Number of pages | 10 |

Journal | Journal of Quantitative Spectroscopy and Radiative Transfer |

Volume | 166 |

DOIs | |

Publication status | Published - 1 Nov 2015 |

## Keywords

- Sulfur dioxide
- Ground state
- High-resolution
- Spectra
- Spectroscopic
- Parameters

## ASJC Scopus subject areas

- Spectroscopy
- Atomic and Molecular Physics, and Optics
- Radiation