|
|||||
|
|
Interactions between vibrational polyads of propyne, H3CCCH: Rotational and rovibrational spectroscopy of the levels around 1000 cm |
|
| Authors: | P Pracna HSP Müller V-M Horneman |
| Institution: | a J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 18223 Prague 8, Czech Republic b I. Physikalisches Institut, Universität zu Köln, Zülpicher. Str. 77, 50937 Köln, Germany c Department of Analytical Chemistry, Institute of Chemical Technology, 16628 Prague 6, Czech Republic d Department of Physical Sciences, University of Oulu, B.O.X. 3000, 90014 University of Oulu, Finland e Institut für Physikalische Chemie, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 58, 35392 Gießen, Germany |
| Abstract: | The study of vibration resonance physics in propyne is based on experimental measurements of about 600 new rotational transitions between 495-590 and 700-760 GHz in excited vibrational levels v5 = 1, v8 = 1, v10 = 3 and v9 = v10 = 1 with vibrational energies around 1000 cm−1. The limits to the assignments and analysis were imposed by as yet unresolved anharmonic resonances with the states of the next higher polyad of levels lying above 1200 cm−1, which affect the rotational states involved in transitions that would be measurable with non-vanishing intensities. Vibration-rotation spectra pertaining to the levels in question were studied in the regions 880-1150 cm−1 (the ν5 and ν8 fundamental bands), 550-750 cm−1 (the v9 = v10 = 1 ← v10 = 1 hot bands) and 250-400 cm−1 (the v10 = 3 ← v10 = 2 “superhot” bands). A simultaneous least-squares fit of both types of data provides their reliable but in the case of accurate rotational data not always fully quantitative reproduction. |
| Keywords: | Methylacetylene High resolution FTIR spectroscopy Submillemeter-wave spectroscopy |
| 本文献已被 ScienceDirect 等数据库收录！ | |