Interactions between vibrational polyads of propyne, H3C-C-CH: Rotational and rovibrational spectroscopy of the levels around 1000 cm(-1)

0336503 - ÚFCH JH 2012 RIV US eng J - Journal Article
Pracna, Petr - Müller, H. S. P. - Urban, Š. - Horneman, V. M. - Klee, S.
Interactions between vibrational polyads of propyne, H3C-C-CH: Rotational and rovibrational spectroscopy of the levels around 1000 cm(-1).
Journal of Molecular Spectroscopy. Roč. 256, č. 1 (2009), s. 152-162. ISSN 0022-2852. E-ISSN 1096-083X
R&D Projects: GA AV ČR IAA400400706; GA AV ČR IAA400400504; GA MŠMT LC06071
Institutional research plan: CEZ:AV0Z40400503
Keywords : methylacetylene * high resolution * FTIR spectroscopy
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 1.542, year: 2009

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 v5 and v8 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.
Permanent Link: http://hdl.handle.net/11104/0180720