Microwave spectrum of methyl chloride in the excited vibrational states: Coriolis interaction between the ν2 and ν5 states |
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Authors: | Misako Imachi Takehiko Tanaka Eizi Hirota |
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Institution: | Department of Chemistry, Faculty of Science, Kyushu University, Fukuoka 812, Japan |
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Abstract: | The rotational spectra of CD335Cl, CD337Cl, CH336Cl, and CH337Cl in the ν2, ν3, ν5, and ν6 states were observed and analyzed. A few lines of the J = 3 → 2 transition were also detected for 12CD335Cl in the 2ν3 state and for 13CD335Cl in the ν3 state. For CH335Cl in the ν6 state the present data on the J = 1 ← 0 and J = 2 ← 1 transitions were combined with the millimeterwave spectra reported by Sullivan and Frenkel to determine the molecular constants. Special attention was given to the ν2 and ν5 spectra which showed the effect of Coriolis resonance. By transferring some of the constants involved from the laser-Stark spectra we determined B5*, B2*, and q5* for CD3Cl. The large effective q5 constant permitted observation of the direct l-doubling transitions of high J. The analysis of the CH3Cl spectra was much less complete than that on CD3Cl because of limited data. The B rotational constants obtained were compared with the previous microwave and infrared results when available.By using the infrared data on ν1 and ν4 we evaluated the equilibrium Be constants (α4B of CD337Cl was estimated), and refined the equilibrium structure of methyl chloride reported by Duncan. |
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