PERTURBATIONS IN THE $v_{1}$ AND $2v_{1}$ SPECTRA OF PROPYNE

Author Institution: Joint Institute for Laboratory Astrophysics, University of Colorado and National Institute of Standards and Technology, and Department of Chemistry and Biochemistry, University of Colorado; Joint Institute for Laboratory Astrophysics, University of Colorado and National Institute of Standards and Technology, and Department of Chemistry and Biochemistry, University of ColoradoHigh resolution, molecular beam spectra of the fundamental and first overtone of the acetylenic C-H stretch in propyne have been obtained in a warm expansion (35 K). Both spectra are perturber. The fundamental has an anomalous K structure due to a distant perturbed. This K structure is exactly reproduced at each value of J. The assignment of the perturber involves calculation of the spectroscopic constants using the SPECTRO program. The appearance of the overtone spectrum is qualitatively different. Here we observe many weak, local perturbations to the spectrum. Deconvolution of the spectrum provides information on the coupling of the C-H stretch to the bath states. The overtone spectrum thus provides insight into process of intramolecular vibrational energy redistribution (IVR)."