Extended assignment and analysis of the ν2 and ν4 infrared bands of 12CH4 |
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Authors: | AG Robiette |
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Institution: | Department of Chemistry, University of Reading, Reading RG6 2AD, United Kingdom |
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Abstract: | Infrared spectra of the ν2 and ν4 bands of 12CH4 have been assigned up to J′ = 20 in the ν4 band and J′ = 17 in the ν2 band. Assignments are presented for over 1000 transitions ranging from 1123 to 1712 cm?1, which involve 652 upper-state energy levels of the two bands. The 652 upper-state levels have been fitted with a weighted standard deviation of 0.0026 cm?1, almost all levels being reproduced to within their experimental error, by a Hamiltonian for the coupled upper states containing 28 refining parameters and 4 fixed parameters. Calculated relative intensities are also tabulated and discussed in relation to recent experimental intensity measurements. |
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