High Resolution Difference Bands of Ethane C2H6 from torsionally Excited Lower States: Rotation-Torsion Structure of the ν2, ν11 and ν4 ν11 Vibrational States.Reportar como inadecuado




High Resolution Difference Bands of Ethane C2H6 from torsionally Excited Lower States: Rotation-Torsion Structure of the ν2, ν11 and ν4 ν11 Vibrational States. - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

* Corresponding author 1 retired 2 Medicinal Chemistry 3 Physics

Abstract : A high resolution Fourier transform infrared spectrum of C2H6, measured with a pressure of 173.3 Pa and an optical path of 153.2 m, was analyzed between 1050 and 1295 cm-1. Extensive absorption due to the difference band ν11-ν4, and several rotation-torsion lines of the difference band ν2-ν4, in the region of the x,y-Coriolis resonance of ν2 and ν11, were observed. This allowed us to perform a detailed rotation-torsion analysis of the upper states ν11 and ν2. The anomalous torsional structure, found in the non-degenerate vibrational state ν2, can be explained as the effect of an Hamiltonian term accounting for a strong dependence of the torsional barrier height on the normal vibrational coordinate q2. The value of the barrier height derivative is estimated to be 127±10 cm-1. We also could detect and assign -hot- difference transitions belonging to the ν4+ν11-2ν4 band, yielding information on the upper state ν4+ν11. We believe that transitions from 3ν4 to 2ν4+ν11 are also detectable in the investigated region.

Keywords : Physical Sciences





Autor: Carlo Di Lauro - Franca Lattanzi - Veli-Matti Horneman -

Fuente: https://hal.archives-ouvertes.fr/



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