CO2 laser Stark spectroscopy of the ν4 band of SiDF3: The C0 rotational constant and vibrationally induced dipole moment

Kensuke Harada, Ichirou Nagano, Susumu Kimura, Keiichi Tanaka, Takehiko Tanaka

Research output: Contribution to journalArticle

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Abstract

The CO2 laser Stark spectroscopy was applied to the ν4 (SiF3 degenerate stretch) fundamental band of SiDF3. 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 ν4 vibrational state. Several perturbation-induced rovibrational transitions obeying the Δ(K - l) = ± 3 selection rules were observed in the Stark spectrum, and the C0 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 μr and the ordinary (2, -1) interaction constant r4 derived from the analysis are ±0.03516(13) D and ±1.896(52) MHz, respectively, the ± signs indicating that μr and r4 have the same sign. The band origin, the Coriolis constant Cζ4, and the vibration-rotation constant α4C 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 ν4 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 μr and the vibrational change δμ4 of the dipole moment.

Original languageEnglish
Pages (from-to)230-245
Number of pages16
JournalJournal of Molecular Spectroscopy
Volume138
Issue number1
DOIs
Publication statusPublished - Jan 1 1989

Fingerprint

Dipole moment
dipole moments
Spectroscopy
Lasers
spectroscopy
lasers
perturbation
vibration
vibrational states
Ground state
standard deviation
Electric fields
interactions
Molecules
ground state
electric fields
excitation
molecules

All Science Journal Classification (ASJC) codes

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

Cite this

CO2 laser Stark spectroscopy of the ν4 band of SiDF3 : The C0 rotational constant and vibrationally induced dipole moment. / Harada, Kensuke; Nagano, Ichirou; Kimura, Susumu; Tanaka, Keiichi; Tanaka, Takehiko.

In: Journal of Molecular Spectroscopy, Vol. 138, No. 1, 01.01.1989, p. 230-245.

Research output: Contribution to journalArticle

Harada, Kensuke ; Nagano, Ichirou ; Kimura, Susumu ; Tanaka, Keiichi ; Tanaka, Takehiko. / CO2 laser Stark spectroscopy of the ν4 band of SiDF3 : The C0 rotational constant and vibrationally induced dipole moment. In: Journal of Molecular Spectroscopy. 1989 ; Vol. 138, No. 1. pp. 230-245.
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