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| Titel: |
Torsional splittings in the v12=1 vibrational state of Si2H6: analysis of the ν6+ν12 and ν9+ν12(E) combination bands in the high resolution infrared spectrum |
| Auteur: |
Lattanzi, F. Lauro, C. Di Horneman, V. -M. |
| Verschenen in: |
Molecular physics |
| Paginering: | Jaargang 104 (2006) nr. 12 pagina's 1795-1817 |
| Jaar: |
2006-06-20 |
| Inhoud: |
The ν6 + ν12 and ν9 + ν12(E) vibrational combination bands of disilane (Si2H6) have been measured at high resolution and analysed. A few K-branches of the hot band associated with ν9 + ν12(E), originated from the torsional state v4 = 1, have also been observed and analysed. These observations give information on the effects of the v12 = 1 vibrational state, not directly accessible in the infrared, on the molecular internal rotation. From the vibrational frequencies of ν9 + ν12(E) and its related hot band, determined in this work, and those of ν9 and its hot band determined previously, we can determine that the torsional barrier height changes by -19.25 cm-1 if the ν12 mode is excited by one quantum. This causes the torsional splitting to increase by about 0.0038 cm-1. The observed torsional splitting in the ν6 + ν12 vibrational state is larger than in the ground vibrational state by 0.0024 cm-1, with a 0.0033 cm-1 change caused by the lowering of the barrier height and a -0.0009 cm-1 change caused by the head-tail and torsional Coriolis mechanisms. The torsional splitting observed in the ν9 + ν12(E) state, -0.0043 cm-1, is inverted with respect to the ground vibrational state (0.0150 cm-1 in the lowest torsional state), showing that this state is closer to the E2s than to the E1d vibrational symmetry description. The analysis of perturbations observed in the rotation-torsion structure of ν9 + ν12(E) yields information on the vibrational states ν2 + ν4 and ν4 + ν11, and on the E3d torsional component of 4ν4 + ν12. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 17 van 17 gevonden artikelen
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