### Abstract

The CO_{2} laser Stark spectroscopy was applied to the ν_{4} (SiF_{3} degenerate stretch) fundamental band of SiDF_{3}. It was found that electric field-dependent interactions of the (Δl, ΔK) = (2, -1) type, caused by the vibrationally induced dipole moment, give remarkable perturbations in the ν_{4} vibrational state. Several perturbation-induced rovibrational transitions obeying the Δ(K - l) = ± 3 selection rules were observed in the Stark spectrum, and the C_{0} rotational constant, which is otherwise hard to obtain for a symmetric-top molecule, was determined to be 4133.55(19) MHz. The vibrationally induced dipole moment μ_{r} and the ordinary (2, -1) interaction constant r_{4} derived from the analysis are ±0.03516(13) D and ±1.896(52) MHz, respectively, the ± signs indicating that μ_{r} and r_{4} have the same sign. The band origin, the Coriolis constant Cζ_{4}, and the vibration-rotation constant α_{4}^{C} are 994.302604(16) cm^{-1}, 2210.26(20) MHz, and 10.070(25) MHz, respectively. The dipole moment is 1.35719(17) D in the ground state, and increases by 0.02649(10) D on excitation of the ν_{4} vibration. The uncertainties given in the parentheses correspond to three standard deviations. A theoretical treatment is presented on the relation between the vibrationally induced dipole moment μ_{r} and the vibrational change δμ_{4} of the dipole moment.

Original language | English |
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Pages (from-to) | 230-245 |

Number of pages | 16 |

Journal | Journal of Molecular Spectroscopy |

Volume | 138 |

Issue number | 1 |

DOIs | |

Publication status | Published - Nov 1989 |

### All Science Journal Classification (ASJC) codes

- Atomic and Molecular Physics, and Optics
- Spectroscopy
- Physical and Theoretical Chemistry

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## Cite this

_{2}laser Stark spectroscopy of the ν

_{4}band of SiDF

_{3}: The C

_{0}rotational constant and vibrationally induced dipole moment.

*Journal of Molecular Spectroscopy*,

*138*(1), 230-245. https://doi.org/10.1016/0022-2852(89)90113-6