High resolution infrared study of the parallel band ν3 of chloroform CH35 Cl3 |
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Authors: | J PIETILÄ V-M HORNEMAN R ANTTILA |
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Institution: | Department of Physical Sciences , University of Oulu, Linnanmaa , FIN-90570, Oulu, Finland |
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Abstract: | The infrared spectrum of chloroform in the region of the parallel fundamental band ν3 around 367 cm?1 has been measured with a Fourier spectrometer at a resolution of 0.001 cm?1. An isotopically pure sample of CH35Cl3 was used. More than 5000 lines were assigned in the ν3 band. A reanalysis of the ground state constants was performed by combining 1671 combination differences from this work, 712 differences from a previous study of the ν2 band, and 80 millimetre wave lines from the literature. In the analysis of the ν3 band, a model of an unperturbed symmetric top band was applied. The data were fitted with a standard deviation of 0.18 × 10?3 cm?1, and the following leading parameters were obtained: ν0 = 367.295 550(8) cm?1, B 3—B 0 = ?77.058(4) × 10?6 cm?1 and C 3—C 0 = ?18.600(11) × 10?6 cm?1. In addition, several hot bands have been studied. The isotopic effects were studied also by analysing spectra of the isotopically natural sample. |
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