The Low-Lying Bending Vibration System ν7of OCCCS Observed at Doppler-Limited Resolution
✍ Scribed by V. Wagener; M. Winnewisser; M. Bellini
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 564 KB
- Volume
- 176
- Category
- Article
- ISSN
- 0022-2852
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✦ Synopsis
Parts of the gas-phase spectrum of the linear cumulene-type molecule tricarbon oxide sulfide, OCCCS, were recorded in the region of its lowest-lying CCC bending vibration n 7 around 2.4 THz. The Doppler-limited spectrum was obtained at low temperatures using a tunable far-infrared spectrometer. In addition, the rotational spectrum was recorded between 78 and 118 GHz with microwave techniques at room temperature. The analysis of 412 rotational transition frequencies obtained during this and previous work allowed us to assign 71 resolved rovibrational transitions of the n 7 band system in the far-infrared region. They are distributed among 16 subbands of the fundamental band and the first three hotbands. The center of the fundamental band was found to be at 2 325 894.20(30) MHz. Forty-five spectroscopic constants describing the vibrational states n 7 Å 0, . . . , 4 were obtained by fitting all data simultaneously to an effective Hamiltonian for polyatomic linear molecules. The anharmonicity coefficient x 0 77 of the bending vibration was found to be only 00.2% of the harmonic frequency v 0 7 , which was determined to be v 0 7 Å 2 320 995(13) MHz.